Only initialise EmojiGrid when not in edit mode

Suppress initialisation of the emoji_grid_layout.xml when the
EmojiDrawer is being used in a layout where the editor is shown,
 to prevent an NPE when an editor is being used.

// FREEBIE

Closes #2288

src/org/thoughtcrime/securesms/components/EmojiDrawer.java

@@ -74,7 +74,10 @@ public class EmojiDrawer extends KeyboardAwareLinearLayout {
     inflater.inflate(R.layout.emoji_drawer, this, true);
 
     initializeResources();
-    initializeEmojiGrid();
+
+    if (!this.isInEditMode()) {
+      initializeEmojiGrid();
+    }
   }
 
   private void initializeResources() {