Add setting to enable focusing on search when loaded

[maxzhirnov]

trafficstars

I make CassaOS web my default new tab view in my Browser. It would be great if i had ooportunity to make search field be focused when ui loaded. That way i still will be able to input my search immidiatly after open new tab and have oll the cassaos goodies in there.

[ETWang1991]

Received, added to requirements pool