Dark theme - Improvements

- spinner bg being white

Riot/ViewController/WebViewViewController.m

@@ -54,6 +54,7 @@
     self.view.backgroundColor = kRiotPrimaryBgColor;
     self.defaultBarTintColor = kRiotSecondaryBgColor;
     self.barTitleColor = kRiotPrimaryTextColor;
+    self.activityIndicator.backgroundColor = kRiotOverlayColor;
     
     webView.backgroundColor = kRiotPrimaryBgColor;
 }