Bug 31625: Reindent tools home and tools sidebar

Bug 31625: Reindent tools home and tools sidebar

This patch performs general template cleanup to the tools-home and
tools-menu templates: Make indentation consistent, replace tabs with
spaces, fix invalid HTML.

To test, apply the patch and go to Tools. The page should look correct,
with no visible changes from before the patch.

Go to any tools page which shows the left-hand sidebar, e.g. Patron
lists, Batch item deletion, Inventory, etc. The menu should look
correct.

Signed-off-by: Andrew Fuerste-Henry <andrewfh@dubcolib.org>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>