Bug 35895: Reindent tags review template

Bug 35895: Reindent tags review template

This patch reindents the tags review template so that it has consistent
indentation, with tab indentation coverted to space.

The patch also adds "FILTER collapse" around the <style> block in the
head of the page.

To test, apply the patch and go to Tools -> Tags.

 - The page should look unchanged.
 - Test that no functionality has been affected:
   - Tag searches
   - Tag status changes
   - Check lists
- If you view the diff while ignoring whitespace the only changes should
  be places where line breaks were introduced

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>