Fix condition order to prevent out of range array accesses, which may
lead to a segfault when unhighlighting two matching parentheses.

Fix by Markus <desterium@t-online.de>.


git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/apps/projectcenter/trunk@38050 72102866-910b-0410-8b05-ffd578937521