Fix open location entry when pressing '~'

Recent changes in GTK default input method
makes ~ char to start as dead key, that's
why filechooser stopped detecting it for the
keybinding to open location entry.

We also make sure '~' appears in the location
entry (instead of being emtpy).

Fixes #4911 for GTK3
7 jobs for gtk3_fix_chooser_dead_tilde_trigger_location in 18 minutes and 4 seconds (queued for 2 seconds)