[TASK] Styling and placement of Toggle All button install tool

The "Toggle All" button in the install tool is currently clickable plain
text, which should be a button. It also needs to move to the fixed footer,
so it's always accessible.

This patch changes the plain text to a button and moves the button to the
fixed footer

Change-Id: I25a57e7a7f0f25fe2fe204f68fe2ee4dbbf1ade0
Resolves: #55469
Releases: 6.2
Reviewed-on: https://review.typo3.org/28243
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters
Reviewed-by: Sebastian Fischer
Tested-by: Sebastian Fischer
Reviewed-by: Steffen Ritter
Tested-by: Steffen Ritter