Fix NPE when going into WiFi Settings

- this was occuring when updating the Index for remembered WiFi networks

Change-Id: Ifc8f843499e09150685a8dd9bfb705459f28c067

src/com/android/settings/search/Index.java

@@ -436,6 +436,7 @@ public class Index {
             Log.e(LOG_TAG, "Cannot find SearchIndexableResources for class name: " + className);
             return false;
         }
+        res.context = mContext;
         res.enabled = includeInSearchResults;
         if (rebuild) {
             deleteIndexableData(res);