[BUGFIX] Fix unset bits in options.alertPopup bitmask

The validation in JsConfirmation did not allow for a value
based on JsConfirmation:ALL with some bits unset.

Change-Id: I74d43d59ee3cd06498bbebd6b7b7682ca1d79cd5
Resolves: #78240
Releases: master, 8.7
Reviewed-on: https://review.typo3.org/50223


Reviewed-by: Mathias Schreiber <mathias.schreiber@typo3.com>
Tested-by: Mathias Schreiber <mathias.schreiber@typo3.com>
Reviewed-by: Reiner Teubner <rteubner@me.com>
Tested-by: Reiner Teubner <rteubner@me.com>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Susanne Moog <susanne.moog@typo3.org>
Tested-by: Susanne Moog <susanne.moog@typo3.org>