Title is different after tapping "Memory used by apps"

“App usage” is displayed as title after tapping
“Memory used by apps” on “Memory” screen. Change the
title from “App usage” to “Memory used by apps” for
consistency.

Bug: 32997657
Change-Id: I3bada43f1fea1ae9acabb151ac68b60900a26dda
diff --git a/src/com/android/settings/applications/ProcessStatsSummary.java b/src/com/android/settings/applications/ProcessStatsSummary.java
index 30701dc..a6f7e8e 100644
--- a/src/com/android/settings/applications/ProcessStatsSummary.java
+++ b/src/com/android/settings/applications/ProcessStatsSummary.java
@@ -113,7 +113,7 @@
             args.putBoolean(ARG_TRANSFER_STATS, true);
             args.putInt(ARG_DURATION_INDEX, mDurationIndex);
             mStatsManager.xferStats();
-            startFragment(this, ProcessStatsUi.class.getName(), R.string.app_list_memory_use, 0,
+            startFragment(this, ProcessStatsUi.class.getName(), R.string.memory_usage_apps, 0,
                     args);
             return true;
         }