Fix an issue where auto completion in query editor would not work in …

…some cases (#2406)

Issue introduced in 0b9fb7e

Source/SPDatabaseStructure.m

@@ -275,6 +275,7 @@ - (void)queryDbStructureWithUserInfo:(NSDictionary *)userInfo
 	// Set up the database as an empty mutable dictionary ready for tables, and store a reference
 	[queriedStructure setObject:[NSMutableDictionary dictionary] forKey:db_id];
 	NSMutableDictionary *databaseStructure = [queriedStructure objectForKey:db_id];
+	structureWasUpdated = YES;
 
 	NSUInteger uniqueCounter = 0; // used to make field data unique
 	SPMySQLResult *theResult;