Bug 27631: (follow-up) tools/marc_modification_templates.tt

Bug 27631: (follow-up) tools/marc_modification_templates.tt

Changed file to have one <h1> tag showing that describes the page,
rather than the <h1> around the logo.

The hierarchy of other heading tags may be wrong, but this will be
dealt with in an additional bug.

To test:
1) Go to the Staff Client
2) Apply patch
3) Go to tools/marc_modification_templates and check that it has an
   obvious and descriptive heading
4) Ensure that the heading is <h1>

Sponsored-by: Catalyst IT
Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>