Fix memory leak in `DBAPI`'s `LoadLocal()`

sources/Data/Database/DBAPI.uc

@@ -166,6 +166,7 @@ public final function LocalDatabaseInstance LoadLocal(BaseText databaseName)
     local Text                  rootRecordName;
     local LocalDatabase         newConfig;
     local LocalDatabaseInstance newLocalDBInstance;
+    local Text                  dbKey;
 
     if (databaseName == none) {
         return none;
@@ -186,7 +187,9 @@ public final function LocalDatabaseInstance LoadLocal(BaseText databaseName)
         return none;
     }
     newLocalDBInstance = LocalDatabaseInstance(_.memory.Allocate(localDBClass));
-    loadedLocalDatabases.SetItem(databaseName.Copy(), newLocalDBInstance);
+    dbKey = databaseName.Copy();
+    loadedLocalDatabases.SetItem(dbKey, newLocalDBInstance);
+    dbKey.FreeSelf();
     if (newConfig.HasDefinedRoot())
     {
         rootRecordName = newConfig.GetRootName();