QmlDesigner: add forgotten componentcore resource

Change-Id: I486c690f848a15ac4675077e786a05fbd65e6a0c
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>

src/plugins/qmldesigner/qmldesignerplugin.qbs

@@ -397,6 +397,7 @@ Project {
                 "componentcore/selectioncontext.h",
                 "componentcore/qmldesignericonprovider.cpp",
                 "componentcore/qmldesignericonprovider.h",
+                "componentcore/componentcore.qrc",
                 "texteditor/texteditorstatusbar.cpp",
                 "texteditor/texteditorstatusbar.h",
                 "componentcore/changestyleaction.cpp",