[MapMarker] fix android release crash on custom marker (react-native-maps#1643)

Author: cjcaj

lib/android/src/main/java/com/airbnb/android/react/maps/AirMapMarker.java

@@ -2,6 +2,7 @@
 
 import android.content.Context;
 import android.graphics.Bitmap;
+import android.graphics.BitmapFactory;
 import android.graphics.Canvas;
 import android.graphics.drawable.Animatable;
 import android.net.Uri;
@@ -236,6 +237,9 @@ public void setImage(String uri) {
       logoHolder.setController(controller);
     } else {
       iconBitmapDescriptor = getBitmapDescriptorByName(uri);
+      if (iconBitmapDescriptor != null) {
+          iconBitmap = BitmapFactory.decodeResource(getResources(), getDrawableResourceByName(uri));
+      }
       update();
     }
   }