Revert "MDL-44548 mod_scorm: force an external sync to check for updated files."

This reverts commit d159b4f18ceb7f757ee726d011b37da4e115fa84.
Revert "MDL-47684 mod: better validation of rating options"

This reverts commit ee1389b8f79c6533151300cf5e100cf26fda9cc0.
weekly release 2.6.5+