TPAC: Remove fixed height from 'View My List' button

The TPAC button styles have been largely consolidated, but this little
outlier got missed.  It doesn't do anything of noticeable value in
recent browsers, and in fact hurts the display by causing the "Sort by"
widget to "hang" when resizing the window to certain intermediate
sizes.  Remove it.

Signed-off-by: Dan Wells <dbw2@calvin.edu>
Signed-off-by: Ben Shum <bshum@biblio.org>