Actually show toast when search is not supported.

Change-Id: I0a5c66b7b6e2dc782e36930a7ee8aba2792774bc
diff --git a/src/com/android/mail/ui/AbstractActivityController.java b/src/com/android/mail/ui/AbstractActivityController.java
index 502ece5..707f587 100644
--- a/src/com/android/mail/ui/AbstractActivityController.java
+++ b/src/com/android/mail/ui/AbstractActivityController.java
@@ -1297,7 +1297,7 @@
             mActivity.startActivity(intent);
         } else {
             Toast.makeText(mActivity.getActivityContext(), mActivity.getActivityContext()
-                    .getString(R.string.search_unsupported), Toast.LENGTH_SHORT);
+                    .getString(R.string.search_unsupported), Toast.LENGTH_SHORT).show();
         }
     }
 }