Remove unused property
Remove unused property

After looking at #13566 I noticed that `_pathRestore` is never actually
set to anything by core tests/classes.

ndm2/cakephp,ADmad/cakephp,ADmad/cakephp,ndm2/cakephp,CakeDC/cakephp,CakeDC/cakephp,cakephp/cakephp,cakephp/cakephp,CakeDC/cakephp,ndm2/cakephp,ADmad/cakephp,ndm2/cakephp,CakeDC/cakephp,ADmad/cakephp,cakephp/cakephp,cakephp/cakephp