Fix always return first package for mock location app in developer options.

The mock location app should be OP_MOCK_LOCATION allowed app, the packageOps.get(0).getPackageName()
is the first app that used the OP_MOCK_LOCATION in history, but maybe rejected.

Change-Id: I0158436dd7d2790f4e9640075bc9c8bd3422f467

src/com/android/settings/development/MockLocationAppPreferenceController.java

@@ -165,7 +165,7 @@ public class MockLocationAppPreferenceController extends DeveloperOptionsPrefere
         if (packageOps != null) {
             for (AppOpsManager.PackageOps packageOp : packageOps) {
                 if (packageOp.getOps().get(0).getMode() == AppOpsManager.MODE_ALLOWED) {
-                    return packageOps.get(0).getPackageName();
+                    return packageOp.getPackageName();
                 }
             }
         }