"Tap to retry" retries, rather than maybe deletes.

Attachment downloads can fail on slow networks or if the app crashes.
It's unlikely that the users response to this would be to delete the
attachment pointer, so it doesn't make sense to surface that as a
primary action.

If a user does want to delete the attachment, as always they can
long-press to delete.

// FREEBIE

Signal/src/ViewControllers/ConversationView/ConversationViewController.m

@@ -1764,43 +1764,17 @@ typedef enum : NSUInteger {
 - (void)handleFailedDownloadTapForMessage:(TSMessage *)message
                         attachmentPointer:(TSAttachmentPointer *)attachmentPointer
 {
-    UIAlertController *actionSheetController = [UIAlertController
-        alertControllerWithTitle:NSLocalizedString(@"MESSAGES_VIEW_FAILED_DOWNLOAD_ACTIONSHEET_TITLE", comment
-                                                   : "Action sheet title after tapping on failed download.")
-                         message:nil
-                  preferredStyle:UIAlertControllerStyleActionSheet];
-
-    [actionSheetController addAction:[OWSAlerts cancelAction]];
-
-    UIAlertAction *deleteMessageAction = [UIAlertAction actionWithTitle:NSLocalizedString(@"TXT_DELETE_TITLE", @"")
-                                                                  style:UIAlertActionStyleDestructive
-                                                                handler:^(UIAlertAction *action) {
-                                                                    [message remove];
-                                                                }];
-    [actionSheetController addAction:deleteMessageAction];
-
-    UIAlertAction *retryAction = [UIAlertAction
-        actionWithTitle:NSLocalizedString(@"MESSAGES_VIEW_FAILED_DOWNLOAD_RETRY_ACTION", @"Action sheet button text")
-                  style:UIAlertActionStyleDefault
-                handler:^(UIAlertAction *action) {
-                    OWSAttachmentsProcessor *processor =
-                        [[OWSAttachmentsProcessor alloc] initWithAttachmentPointer:attachmentPointer
-                                                                    networkManager:self.networkManager];
-                    [processor fetchAttachmentsForMessage:message
-                        primaryStorage:self.primaryStorage
-                        success:^(TSAttachmentStream *attachmentStream) {
-                            DDLogInfo(
-                                @"%@ Successfully redownloaded attachment in thread: %@", self.logTag, message.thread);
-                        }
-                        failure:^(NSError *error) {
-                            DDLogWarn(@"%@ Failed to redownload message with error: %@", self.logTag, error);
-                        }];
-                }];
-
-    [actionSheetController addAction:retryAction];
-
-    [self dismissKeyBoard];
-    [self presentViewController:actionSheetController animated:YES completion:nil];
+    OWSAttachmentsProcessor *processor =
+        [[OWSAttachmentsProcessor alloc] initWithAttachmentPointer:attachmentPointer
+                                                    networkManager:self.networkManager];
+    [processor fetchAttachmentsForMessage:message
+        primaryStorage:self.primaryStorage
+        success:^(TSAttachmentStream *attachmentStream) {
+            DDLogInfo(@"%@ Successfully redownloaded attachment in thread: %@", self.logTag, message.thread);
+        }
+        failure:^(NSError *error) {
+            DDLogWarn(@"%@ Failed to redownload message with error: %@", self.logTag, error);
+        }];
 }
 
 - (void)handleUnsentMessageTap:(TSOutgoingMessage *)message