Fix potential cast exception

when casting to `Spannable` in `CommentTextOnTouchListener`

app/src/main/java/org/schabi/newpipe/info_list/holder/CommentsMiniInfoItemHolder.java

@@ -115,7 +115,7 @@ public class CommentsMiniInfoItemHolder extends InfoItemHolder {
 
         itemContentView.setLines(COMMENT_DEFAULT_LINES);
         commentText = item.getCommentText();
-        itemContentView.setText(commentText);
+        itemContentView.setText(commentText, TextView.BufferType.SPANNABLE);
         itemContentView.setOnTouchListener(CommentTextOnTouchListener.INSTANCE);
 
         if (itemContentView.getLineCount() == 0) {