drastic-dark theme: added border radius to logout button also for safari.
drastic-dark theme: added border radius to logout button also for safari.

tylermalin/web-app-theme,jmptrader/web-app-theme,tvw/web-app-theme,pilu/web-app-theme,jmptrader/web-app-theme,tylermalin/web-app-theme,tylermalin/web-app-theme,pilu/web-app-theme,tvw/web-app-theme,sideci-sample/sideci-sample-web-app-theme,jmptrader/web-app-theme,sideci-sample/sideci-sample-web-app-theme