Fix emoji rendering artifact.

There's sometimes this one pixel line that can appear next to them.
Easiest solution for now is to trim it off.

app/src/main/java/org/thoughtcrime/securesms/components/emoji/EmojiProvider.java

@@ -122,10 +122,10 @@ class EmojiProvider {
       final int xStart      = (index % emojiPerRow) * glyphWidth;
       final int yStart      = (index / emojiPerRow) * glyphHeight;
 
-      this.emojiBounds = new Rect(xStart,
+      this.emojiBounds = new Rect(xStart + 1,
-                                  yStart,
+                                  yStart + 1,
-                                  xStart + glyphWidth,
+                                  xStart + glyphWidth - 1,
-                                  yStart + glyphHeight);
+                                  yStart + glyphHeight - 1);
     }
 
     @Override