Squish: Remove further unstable lines from project tree

Change-Id: I985fcce7297fe6508514c0476a16553905063c11
Reviewed-by: Christian Stenger <christian.stenger@digia.com>

tests/system/suite_general/tst_openqt_creator/testdata/projecttree_creator.tsv

@@ -10866,12 +10866,6 @@
 "instances"	"4"
 "instances.pri"	"5"
 "Headers"	"5"
-"nodeinstanceclientproxy.h"	"6"
-"Sources"	"5"
-"nodeinstanceclientproxy.cpp"	"6"
-"instances"	"4"
-"instances.pri"	"5"
-"Headers"	"5"
 "anchorchangesnodeinstance.h"	"6"
 "behaviornodeinstance.h"	"6"
 "childrenchangeeventfilter.h"	"6"