please review fix of issue #162945 - token position was not initialized properly

Issue:
http://www.netbeans.org/nonav/issues/show_bug.cgi?id=162945

Fix:
http://hg.netbeans.org/web-main/rev/e34e7dffb7b8

Wrong method was used to initialize token position - instead of method 
which jumps to a fixed offset use method which moves backwards if 
necessary. More details are in the issue. Fix is trivial and error free.

Thanks,
David