[Glitch] Fix report reason selector in moderation interface not unselecting rules when changing category

Port 9ce914cc89 to glitch-soc

Signed-off-by: Claire <claire.github-309c@sitedethib.com>

app/javascript/flavours/glitch/components/admin/ReportReasonSelector.jsx

@@ -124,7 +124,7 @@ class ReportReasonSelector extends PureComponent {
 
     api().put(`/api/v1/admin/reports/${id}`, {
       category,
-      rule_ids,
+      rule_ids: category === 'violation' ? rule_ids : [],
     }).catch(err => {
       console.error(err);
     });