[android] #4283 - enable strict mode in test app + fix strict mode warning related to releasing the surface

platform/android/MapboxGLAndroidSDKTestApp/src/main/java/com/mapbox/mapboxsdk/testapp/MapboxApplication.java

@@ -1,6 +1,7 @@
 package com.mapbox.mapboxsdk.testapp;
 
 import android.app.Application;
+import android.os.StrictMode;
 
 import com.squareup.leakcanary.LeakCanary;
 
@@ -10,5 +11,17 @@ public class MapboxApplication extends Application {
     public void onCreate() {
         super.onCreate();
         LeakCanary.install(this);
+        StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder()
+                .detectDiskReads()
+                .detectDiskWrites()
+                .detectNetwork()   // or .detectAll() for all detectable problems
+                .penaltyLog()
+                .build());
+        StrictMode.setVmPolicy(new StrictMode.VmPolicy.Builder()
+                .detectLeakedSqlLiteObjects()
+                .detectLeakedClosableObjects()
+                .penaltyLog()
+                .penaltyDeath()
+                .build());
     }
 }