Bug 33455: Fix the size of the patron change password heading

Bug 33455: Fix the size of the patron change password heading

The H1 heading on the patron change password page in the staff
interface is too big and should be outside of the area with
form area with the white background.

Test plan:
1. In the staff interface, click on top right of menu and navigate
   to my account.
2. Click the 'Change password' button.
3. Note that title is now outside the legend and font size is
   comparable to other H1 headings (e.g. Duplicate).

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Matt Blenkinsop <matt.blenkinsop@ptfs-europe.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>