another bugfix for xftree.

[Edscott Wilson García]

I was just checking some xftree problems on FreeBSD and discovered that a typo 
of six weeks ago reappeared. After checking the CVS history I found that the 
typo was in two places, not one. Now both are corrected. The typo causes  
problemas on startup, like a crash, YMMV. I believe this is could be the 
problem experienced by the user who has trouble with xfce from 3.8.16 but not 
with 3.8.14.

Edscott