Fix 0003027: History summary a little bit too wide in emails.

M core/email_api.php

• Changed the field sizes used in formatting the history columns.

git-svn-id: http://mantisbt.svn.sourceforge.net/svnroot/mantisbt/trunk@2152 <a class="text" href="/?p=mantisbt.git;a=object;h=f5dc347c">f5dc347c</a>-c33d-0410-90a0-b07cc1902cb9