Lantern Desktop Beta 8.0.0 collected testing issues

[atavism]

Resolves https://github.com/getlantern/engineering/issues/1336

• Make text fields 56px high on desktop
• Remove floating label near cursor from text area on report issue screen

[jigar-f]

LGTM @atavism

[atavism]

@jigar-f I made one more change to add an ffi method to exit the app (instead of calling SystemChannels.platform.invokeMethod('SystemNavigator.pop') when Exit is selected via the system tray menu.

That seems to work much better. Do the changes still look good to you?

[jigar-f]

Let me check.

[jigar-f]

@atavism when exit is called by go, it's considered a crash on the flutter end. I see an error related to Crashed Thread: 3 io.flutter.ui I think we should use both, Go will end all go process and flutter will flutter process.