fix: fix RTL text in editor of xblock problem.
fix: fix RTL text in editor of xblock problem.

(cherry picked from commit 96e903c86c4a0031b21fc564d824a2c02bf98d9c)

eduNEXT/edunext-platform,eduNEXT/edunext-platform,eduNEXT/edunext-platform,eduNEXT/edunext-platform