Correctly set update URL even for old versions of US.o scripts.
Correctly set update URL even for old versions of US.o scripts.

Fixes #1474

the8472/greasemonkey,Martii/greasemonkey,HasClass0/greasemonkey,Ventero/greasemonkey,Ventero/greasemonkey,HasClass0/greasemonkey,Martii/greasemonkey,the8472/greasemonkey