PointSymbolEditorWidget: Update symbol after adding path point

When adding a path point by the '+' button the symbol was not updated.
Since the point is normally duplicated this had no visual impact.
However, if no row is selected then a default point at (0,0) is created
which was not shown in this case.

src/gui/symbols/point_symbol_editor_widget.cpp

@@ -777,6 +777,8 @@ void PointSymbolEditorWidget::addCoordClicked()
 	int row = (coords_table->currentRow() < 0) ? coords_table->rowCount() : (coords_table->currentRow() + 1);
 	updateCoordsTable();	// NOTE: incremental updates (to the curve start boxes) would be possible but mean some implementation effort
 	coords_table->setCurrentItem(coords_table->item(row, coords_table->currentColumn()));
+	map->updateAllObjectsWithSymbol(symbol);
+	emit symbolEdited();
 }
 
 void PointSymbolEditorWidget::deleteCoordClicked()