Revert "This was already fixed in version 1.3.6 from commit 1f685d0f7956edfa2b4071259ce00d80923b7d28, so using that instead"

This reverts commit 4331058a641a21752384b3ae2e20b26abe61710c.
Revert "Merge branch '1.3.x' into CNMSUP-43", since version 1.3.6 introduces a new dependency that makes TinyMCE not longer works with Plone before 4.3

This reverts commit 39118442364ff2cc74da44dc44008a3bb846ac1a, reversing
changes made to 645f4c6f14e10ca2f2c7edb5951e9d7004963280.