"Select search bar" hotkey within search bar should select all text

ctrl+L will focus the search bar and select all the text, like a browser. While the search bar has focus, in a browser ctrl+L will select all the text (i.e. the behavior doesn't change depending on what's focused) while in zeal ctrl+L will do nothing.

I propose we make ctrl+L select all the text no matter what is focused (particularly solving the issue where ctrl+L does nothing while the search bar is focused).