Refresh button should load using accessed URL not typed URL

[KyGost]

If user types a URL in the URL bar and then abandons it and later clicks refresh, the URL typed will be the URL loaded.

In other browsers and, perhaps, the expected behaviour is for the current page/URL to refresh and perhaps the URL bar to fresh to its accessed URL.

[RangerMauve]

I think there's two ways we can approach this:

• Spit the refresh/go button into two buttons (this is what most browsers do)
• When you de-focus the omni-box, it should revert to whatever the current URL is
• Something else

[KyGost]

I feel like the defocus could be a good solution.
One would need to have a go with it first and see if it feels odd/bad though.

[jolindroth]

I think we can reuse the custom event from #139. Currently the event is only fired when we press the ESC-button, but if we can make it fire on focusing the BrowserView/WebContents I think we will get the behaviour we want.
May require some workarounds since there's no native support for focus events of BrowserView/WebContents in electron yet: electron/electron#25873

[RangerMauve]

I think the UX after @jolindroth 's fix in #139 makes this usable. Basically, after we navigate away the URL bar gets reset so you can reload normally again. 🎉