Merge pull request #6000 from mavlink/offlineMapTiles

Offline map fixes

src/QtLocationPlugin/QGCTileCacheWorker.h

@@ -76,6 +76,7 @@ private:
     bool        _createDB               (QSqlDatabase *db, bool createDefault = true);
     quint64     _getDefaultTileSet      ();
     void        _updateTotals           ();
+    void        _deleteTileSet          (qulonglong id);
 
 signals:
     void        updateTotals            (quint32 totaltiles, quint64 totalsize, quint32 defaulttiles, quint64 defaultsize);