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

@@ -74,8 +74,11 @@ public class EmojiDrawer extends KeyboardAwareLinearLayout {
     inflater.inflate(R.layout.emoji_drawer, this, true);
 
     initializeResources();
+
+    if (!this.isInEditMode()) {
       initializeEmojiGrid();
     }
+  }
 
   private void initializeResources() {
     this.pager     = (ViewPager                ) findViewById(R.id.emoji_pager);