Quickfill cells: Remove the selection after a delete.

So that new characters aren't selected afterwards.

gnucash/register/register-core/quickfillcell.c

@@ -192,6 +192,8 @@ gnc_quickfill_cell_modify_verify (BasicCell *_cell,
             gnc_quickfill_cell_set_original (cell, NULL);
 
         gnc_basic_cell_set_value_internal (&cell->cell, newval);
+        // Remove any selection.
+        *end_selection = *start_selection = *cursor_position;
         return;
     }