show IME emoji button when using system

Closes #4043
// FREEBIE

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

@@ -64,7 +64,8 @@ public class ComposeText extends EmojiEditText {
   }
 
   public void setTransport(TransportOption transport) {
-    final boolean enterSends = TextSecurePreferences.isEnterSendsEnabled(getContext());
+    final boolean enterSends     = TextSecurePreferences.isEnterSendsEnabled(getContext());
+    final boolean useSystemEmoji = TextSecurePreferences.isSystemEmojiPreferred(getContext());
 
     int imeOptions = (getImeOptions() & ~EditorInfo.IME_MASK_ACTION) | EditorInfo.IME_ACTION_SEND;
     int inputType  = getInputType();
@@ -72,6 +73,10 @@ public class ComposeText extends EmojiEditText {
     if (isLandscape()) setImeActionLabel(transport.getComposeHint(), EditorInfo.IME_ACTION_SEND);
     else               setImeActionLabel(null, 0);
 
+    if (useSystemEmoji) {
+      inputType = (inputType & ~InputType.TYPE_MASK_VARIATION) | InputType.TYPE_TEXT_VARIATION_SHORT_MESSAGE;
+    }
+
     inputType  = !isLandscape() && enterSends
                ? inputType & ~InputType.TYPE_TEXT_FLAG_MULTI_LINE
                : inputType | InputType.TYPE_TEXT_FLAG_MULTI_LINE;