fix(image): android production build fix with native-api-usage

Author: farfromrefug

packages/image/platforms/android/java/com/nativescript/image/OkHttpNetworkFetcher.java

@@ -13,7 +13,7 @@
 import okhttp3.OkHttpClient;
 import okhttp3.Request;
 
-class OkHttpNetworkFetcher extends com.facebook.imagepipeline.backends.okhttp3.OkHttpNetworkFetcher {
+public class OkHttpNetworkFetcher extends com.facebook.imagepipeline.backends.okhttp3.OkHttpNetworkFetcher {
 
   private static final String TAG = "OkHttpNetworkFetcher";