Remove default splash layout color on Android (#7276)

Co-authored-by: Ward Abbass <warda@wix.com>

Author: svbutko

lib/android/app/src/main/java/com/reactnativenavigation/NavigationActivity.java

@@ -29,7 +29,7 @@
 public class NavigationActivity extends AppCompatActivity implements DefaultHardwareBackBtnHandler, PermissionAwareActivity, JsDevReloadHandler.ReloadListener {
     @Nullable
     private PermissionListener mPermissionListener;
-    
+
     protected Navigator navigator;
 
     @Override
@@ -146,7 +146,6 @@ public void onReload() {
 
     protected void addDefaultSplashLayout() {
         View view = new View(this);
-        view.setBackgroundColor(Color.WHITE);
         setContentView(view);
     }