Pluck out JoinRuleSettings styles so they apply in space settings too

src/components/views/settings/JoinRuleSettings.tsx

@@ -97,7 +97,7 @@ const JoinRuleSettings = ({ room, promptUpgrade, onError, beforeChange, closeSet
     if (roomSupportsRestricted || preferredRestrictionVersion || joinRule === JoinRule.Restricted) {
         let upgradeRequiredPill;
         if (preferredRestrictionVersion) {
-            upgradeRequiredPill = <span className="mx_SecurityRoomSettingsTab_upgradeRequired">
+            upgradeRequiredPill = <span className="mx_JoinRuleSettings_upgradeRequired">
                 { _t("Upgrade required") }
             </span>;
         }
@@ -165,7 +165,7 @@ const JoinRuleSettings = ({ room, promptUpgrade, onError, beforeChange, closeSet
                     }) }
                 </span>
 
-                <div className="mx_SecurityRoomSettingsTab_spacesWithAccess">
+                <div className="mx_JoinRuleSettings_spacesWithAccess">
                     <h4>{ _t("Spaces with access") }</h4>
                     { shownSpaces.map(room => {
                         return <span key={room.roomId}>