Fix sharing text via ShareActivity intents

Fixes #2855
Closes #2865

// FREEBIE

src/org/thoughtcrime/securesms/ConversationFragment.java

@@ -237,7 +237,7 @@ public class ConversationFragment extends ListFragment
 
   private void handleForwardMessage(MessageRecord message) {
     Intent composeIntent = new Intent(getActivity(), ShareActivity.class);
-    composeIntent.putExtra(ConversationActivity.DRAFT_TEXT_EXTRA, message.getDisplayBody().toString());
+    composeIntent.putExtra(Intent.EXTRA_TEXT, message.getDisplayBody().toString());
     startActivity(composeIntent);
   }
 

src/org/thoughtcrime/securesms/ShareActivity.java

@@ -117,7 +117,7 @@ public class ShareActivity extends PassphraseRequiredActionBarActivity
 
   private Intent getBaseShareIntent(final Class<?> target) {
     final Intent intent      = new Intent(this, target);
-    final String textExtra   = getIntent().getStringExtra(ConversationActivity.DRAFT_TEXT_EXTRA);
+    final String textExtra   = getIntent().getStringExtra(Intent.EXTRA_TEXT);
     final Uri    streamExtra = getIntent().getParcelableExtra(Intent.EXTRA_STREAM);
     final String type        = streamExtra != null ? getMimeType(streamExtra) : getIntent().getType();