[BUGFIX] Render success message again in InfoboxViewHelper

The function forceIntegerInRange can't handle the value zero.
Use isIntegerInRange instead.

Resolves: #71562
Releases: master,7.6
Change-Id: Ia0e48774ff7b78d46116ad7d2d3348f5e0c65b1a
Reviewed-on: https://review.typo3.org/45652


Reviewed-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Markus Klein <markus.klein@typo3.org>
Reviewed-by: Daniel Goerz <ervaude@gmail.com>
Tested-by: Daniel Goerz <ervaude@gmail.com>
Reviewed-by: Georg Tiefenbrunn <georg.tiefenbrunn@gmail.com>
Tested-by: Georg Tiefenbrunn <georg.tiefenbrunn@gmail.com>
Reviewed-by: Andreas Fernandez <typo3@scripting-base.de>
Tested-by: Andreas Fernandez <typo3@scripting-base.de>