Now really fix the treeviewfind test for 2.7

Change-Id: Ia3d1fa31bb8045ecb7638c5dfe800bb57f449cfa
Reviewed-by: Christian Stenger <christian.stenger@digia.com>

tests/auto/treeviewfind/treeviewfind.pro

@@ -2,7 +2,7 @@ include(../qttest.pri)
 
 include($$IDE_SOURCE_TREE/src/plugins/find/find.pri)
 
-LIBS *= -L$$IDE_LIBRARY_PATH/QtProject
+LIBS *= -L$$IDE_PLUGIN_PATH/QtProject
 
 SOURCES += \
     tst_treeviewfind.cpp