Fix bug #18017952 It does not search all possible "USB" results that can be found in the settings

- add indexing for UsbSettings
- change constant name from RANK_MEMORY to RANK_STORAGE
- fix old issue with the PreferenceScreen title (as Location instead of USB computer connection)

Change-Id: I1395ec3d6a795edf73a8703545540456a477cc21

res/xml/usb_settings.xml

@@ -15,7 +15,7 @@
 -->
 
 <PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
-        android:title="@string/location_settings_title">
+        android:title="@string/storage_title_usb">
 
     <PreferenceCategory
             android:title="@string/usb_connection_category" />