Patch Version 1.2.37 : Fix a bug introduced in patch 1.2.36

This Jms Multisites patch definition 1.2.37 fix a bug introduced in a patch modified in 1.2.36 when replacing an existing patch by a new one.

When the patch is not correctly installed, it may happen that the access to the standard Joomla "manage template" is corrupted.

The new fix recover the last backup file and reapply the patch correctly on it.