Fix #2833: Titlebar is overlapped by toolbar in fullscreen
Fix #2833: Titlebar is overlapped by toolbar in fullscreen

Fix issue where detail web view would be overlapped by the toolbar in full screen by setting web view constraints to use the `safeAreaLayoutGuide` in macOS 11+.

brentsimmons/Evergreen,brentsimmons/Evergreen,brentsimmons/Evergreen,brentsimmons/Evergreen