Use the unique resource identifier in editabletreemodel example

Fixes: QTBUG-122210
Pick-to: 6.6
Change-Id: I86200961384de6fd57f5c140120461faada4fb4d
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>
(cherry picked from commit 3f31290)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

examples/widgets/itemviews/editabletreemodel/CMakeLists.txt

@@ -71,7 +71,7 @@ if(ANDROID)
     )
 endif()
 
-qt_add_resources(editabletreemodel_tester "editabletreemodel"
+qt_add_resources(editabletreemodel_tester "editabletreemodel_tester"
     PREFIX
         "/"
     FILES