Don't do equal comparison with trim memory level.

It is possible for the app to get different values, for example
if memory is already low then it will immediately go to one of
the low memory levels when the app goes in the background.

Change-Id: I6522cb0385748d926ea7868eacaf588790672f1b
diff --git a/src/com/android/launcher2/Launcher.java b/src/com/android/launcher2/Launcher.java
index d8a4384..4e0f980 100644
--- a/src/com/android/launcher2/Launcher.java
+++ b/src/com/android/launcher2/Launcher.java
@@ -2559,7 +2559,7 @@
     @Override
     public void onTrimMemory(int level) {
         super.onTrimMemory(level);
-        if (level == ComponentCallbacks2.TRIM_MEMORY_UI_HIDDEN) {
+        if (level >= ComponentCallbacks2.TRIM_MEMORY_UI_HIDDEN) {
             mAppsCustomizeTabHost.onTrimMemory();
         }
     }