fixed a problem with $conf['fullpath']

Ignore-this: 236897eb557ad490009ccce53f6d216a
The option wasn't honored on some diff views, revealing a full
path. This was caused by the recent change to make the revert
button work on diff views.

darcs-hash:20091029194628-6e07b-5eabcfeeb2651b8b580912c5d418b174b4aaf107.gz