[BUGFIX] Install tool: Disable/Enable db analyzer buttons

The database analyzer buttons "Run again" and "Apply" are
now disabled when a scan is in progress.
This prevents multiple ajax calls in
parallel which lead to duplicate output.

Change-Id: I28df15e2c7169960e0889aed903bbd72034f07cc
Resolves: #82152
Related: #76084
Releases: master
Reviewed-on: https://review.typo3.org/53821


Reviewed-by: Andreas Fernandez <typo3@scripting-base.de>
Tested-by: Andreas Fernandez <typo3@scripting-base.de>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>