Revert "Fix building treeviewfind test."

That shouldn't have gone into 2.7...
This reverts commit 4647cb77.

Change-Id: I4abfc8120d7c3d5a6b9e11d212f955cd66ba01a5
Reviewed-by: Eike Ziller <eike.ziller@digia.com>

tests/auto/treeviewfind/treeviewfind.pro

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