[TASK] ext:beuser delete button title attribute

Add missing title attribute to delete button in the backend user
listing module.

Resolves: #79203
Releases: master
Change-Id: I511fdce6d29cf8c38682e08f14d2cbb33d127c77
Reviewed-on: https://review.typo3.org/51202


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Daniel Goerz <ervaude@gmail.com>
Tested-by: Daniel Goerz <ervaude@gmail.com>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Benni Mack <benni@typo3.org>