sidebar: Don't use get_children() when removing route entries

Marcus Lundblad requested to merge wip/mlundblad/fix-routequery-reset into main

Don't attempt to use the old get_children() from GtkContainer when enumerating the route entry list when resetting the query entries. Also remove left-over code from old GTK3 focus handling for the route entries.

Fixes #570 (closed)

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