[BUGFIX] Install tool css id used twice

css id 't3-install-password' is used twice in 'change install tool password'
and again in 'create administrator', clicking the password label of the admin
section thus sets focus on the 'change install tool password' input field.

Rename css if of the 'create administrator' section.

Change-Id: Iaacd87b5df77cee20593018303e5943df4801d0a
Resolves: #80607
Releases: master
Reviewed-on: https://review.typo3.org/52346


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Stefan Neufeind <typo3.neufeind@speedpartner.de>
Tested-by: Stefan Neufeind <typo3.neufeind@speedpartner.de>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>