fix fast earmark undo bug
When you undo a fast created earmark with 2 numbers, the 9x9 breaks. To fix it, add line `NEW_G=${NEW_G// /0}` to `reg_history' function. See [ christosangel/tui-sudoku@be0e65db]( christosangel/tui-sudoku@be0e65db)
When you undo a fast created earmark with 2 numbers, the 9x9 breaks. To fix it, add line `NEW_G=${NEW_G// /0}` to `reg_history' function. See [ christosangel/tui-sudoku@be0e65db]( christosangel/tui-sudoku@be0e65db)