fix(android): maintain status bar color during splash

[sbannigan]

This fixes #1761 so the splash screen doesn't override the status bar color when it's visible. The reason this was broken was the flags were not getting applied from the window properly. It should have been:

a.getWindow().getAttributes().flags | (WindowManager.LayoutParams.FLAG_FULLSCREEN);

instead of

a.getWindow().getAttributes().flags & (WindowManager.LayoutParams.FLAG_FULLSCREEN);

but the fullscreen flag was replicating the behavior of the splashFullScreen config, so I removed it.

splashImage.setFitsSystemWindows(true); is required so the splash screen does not appear behind the action bar.

[jcesarmobile]

nice, thanks!