fix: contentstore next section navigation (#27112)
fix: contentstore next section navigation (#27112)

Fixes bug introduced by #25965 (commit dd96a2) pointed out in:

  https://github.com/edx/edx-platform/commit/dd96a2#r48570091

The next button redirect at the top of the sequence in Studio's Unit editing view
was not going to the correct location.


edx/edx-platform,arbrandes/edx-platform,EDUlib/edx-platform,EDUlib/edx-platform,eduNEXT/edx-platform,eduNEXT/edx-platform,edx/edx-platform,eduNEXT/edunext-platform,angelapper/edx-platform,eduNEXT/edunext-platform,EDUlib/edx-platform,edx/edx-platform,angelapper/edx-platform,edx/edx-platform,eduNEXT/edunext-platform,eduNEXT/edx-platform,EDUlib/edx-platform,angelapper/edx-platform,arbrandes/edx-platform,eduNEXT/edunext-platform,arbrandes/edx-platform,angelapper/edx-platform,arbrandes/edx-platform,eduNEXT/edx-platform