Fix using BACKSPACE key in input dialogs

[simonovich]

This hotfix provides a solution to the problem below

Problem:

• Input error when using button BACKSPACE

Reproduce:

Hold down the BACKSPACE key in any input dialog from the examples folder.

Get error:

PHP Fatal error:  Uncaught TypeError: Argument 2 passed to PhpSchool\CliMenu\Input\InputIO::drawInput() must be of the type string, bool given, called in /opt/hg/cli-menu/src/Input/InputIO.php on line 80 and defined in /opt/hg/cli-menu/src/Input/InputIO.php:205
Stack trace:
#0 /opt/hg/cli-menu/src/Input/InputIO.php(80): PhpSchool\CliMenu\Input\InputIO->drawInput()
#1 /opt/hg/cli-menu/src/Input/Text.php(94): PhpSchool\CliMenu\Input\InputIO->collect()
#2 /opt/hg/cli-menu/examples/input-text.php(12): PhpSchool\CliMenu\Input\Text->ask()
#3 /opt/hg/cli-menu/src/CliMenu.php(459): {closure}()
#4 /opt/hg/cli-menu/src/CliMenu.php(311): PhpSchool\CliMenu\CliMenu->executeCurrentItem()
#5 /opt/hg/cli-menu/src/CliMenu.php(595): PhpSchool\CliMenu\CliMenu->display()
#6 /opt/hg/cli-menu/examples/input-text.php(26): PhpSchool\CliMenu\CliMenu->open()
#7 {main}
  thrown in /opt/hg/cli-menu/src/Input/InputIO.php on line 205

Expected

• continue working without errors

[AydinHassan]

LGTM thanks!