Fix sitegroup typo, VLANGroupFilterForm field didn't match between form and filterset (#18947)

netbox/ipam/forms/filtersets.py

@@ -423,7 +423,7 @@ class FHRPGroupFilterForm(NetBoxModelFilterSetForm):
 class VLANGroupFilterForm(NetBoxModelFilterSetForm):
     fieldsets = (
         FieldSet('q', 'filter_id', 'tag'),
-        FieldSet('region', 'sitegroup', 'site', 'location', 'rack', name=_('Location')),
+        FieldSet('region', 'site_group', 'site', 'location', 'rack', name=_('Location')),
         FieldSet('cluster_group', 'cluster', name=_('Cluster')),
         FieldSet('contains_vid', name=_('VLANs')),
     )
@@ -433,7 +433,7 @@ class VLANGroupFilterForm(NetBoxModelFilterSetForm):
         required=False,
         label=_('Region')
     )
-    sitegroup = DynamicModelMultipleChoiceField(
+    site_group = DynamicModelMultipleChoiceField(
         queryset=SiteGroup.objects.all(),
         required=False,
         label=_('Site group')