Fixing singleton initialization

//FREEBIE

Signal/src/network/PushManager.m

@@ -25,15 +25,21 @@
     static dispatch_once_t onceToken;
     dispatch_once(&onceToken, ^{
         sharedManager = [self new];
-        sharedManager.missingPermissionsAlertView = [[UIAlertView alloc] initWithTitle:NSLocalizedString(@"ACTION_REQUIRED_TITLE", @"")
+    });
+    return sharedManager;
+}
+
+- (instancetype)init{
+    self = [super init];
+    if (self) {
+        self.missingPermissionsAlertView = [[UIAlertView alloc] initWithTitle:NSLocalizedString(@"ACTION_REQUIRED_TITLE", @"")
                                                                       message:NSLocalizedString(@"PUSH_SETTINGS_MESSAGE", @"")
                                                                      delegate:nil
                                                             cancelButtonTitle:NSLocalizedString(@"OK", @"")
                                                             otherButtonTitles:nil, nil];
-    });
-    return sharedManager;
     }
-
+    return self;
+}
 
 - (void)verifyPushPermissions{
     if (self.isMissingMandatoryNotificationTypes || self.needToRegisterForRemoteNotifications){