[BUGFIX] Add focus to user confirmation password field

Since #92836 backend users have to confirm their
password on accessing the install tool in the backend.

The corresponding password field now properly gets
the focus assigned. This improves the accessibility,
especially for keyboard users who otherwise had to
tab through the whole module menu first.

Resolves: #92895
Releases: master, 10.4, 9.5
Change-Id: I001f851b3730a864923c73a766026ed18d9c5466
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/66773


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Daniel Haupt <mail@danielhaupt.de>
Tested-by: Frank Nägler <frank.naegler@typo3.org>
Reviewed-by: Markus Klein <markus.klein@typo3.org>
Reviewed-by: Daniel Haupt <mail@danielhaupt.de>
Reviewed-by: Frank Nägler <frank.naegler@typo3.org>