Join rules: fix migration

matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/database/RealmSessionStoreMigration.kt

@@ -267,7 +267,7 @@ class RealmSessionStoreMigration @Inject constructor() : RealmMigration {
                                 joinRulesContentAdapter.fromJson(it)?.joinRules
                             }
 
-                    obj.setString(RoomSummaryEntityFields.JOIN_RULES_STR, roomJoinRules?.value)
+                    obj.setString(RoomSummaryEntityFields.JOIN_RULES_STR, roomJoinRules?.name)
                 }
     }
 }