ev-window.c: Don't send Ctrl and Alt accels to sidebar

Don't send Ctrl and Alt accels to sidebar, as they may be handled by
GtkTreeView or other sidebar focused widgets, while we want them to reach
the main EvApplication accels.

We except GtkEntry's (eg. cell tex editing in tree views) as eg. Ctrl+L
accel should be handled by GtkEntry instead of rotating document.

Issues #860 and #795
Status Job ID Name Coverage
  Build
passed #82388
flatpak

00:10:18

manual #82387
allowed to fail manual
gtk-doc
passed #82386
master

00:04:51