ui: project settings fix

* fixed open folder dialog in project settings.
* changed foreign key relation of component_access from the element to the edge table.

src/lib/data/SqliteStorage.cpp

@@ -707,7 +707,7 @@ void SqliteStorage::setupTables()
 			"edge_id INTEGER, "
 			"type INTEGER NOT NULL, "
 			"PRIMARY KEY(id), "
-			"FOREIGN KEY(edge_id) REFERENCES element(id) ON DELETE CASCADE);"
+			"FOREIGN KEY(edge_id) REFERENCES edge(id) ON DELETE CASCADE);"
 	);
 }