BUG:11312 Fix renaming GeoIP groups

BUG:11312 Fix renaming GeoIP groups

When renaming a GeoIP Group, the corresponding names in
firewallrules (if any) are not changed accordingly. Now
when changing a GeoIP Group the firewallrules are renamed
correctly.

Slightly improved first version of this patch (contained
a blank line with trailing whitespace). No functionality
changed, patch has been confirmed as working correctly.

Fixes: #11312
Signed-off-by: Peter Müller <peter.mueller@link38.eu>
Signed-off-by: Alexander Marx <alexander.marx@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>