Fixed a problem with update of manual folds
Fixed a problem with update of manual folds

For some reason, when I opened a file directly the manual fold method
was not refreshed correctly initially.

The present fix fixes the problem by refreshing the folds after first
CursorMoved event, which seems to work nicely.  Note that the autocommand
is deleted immediately.

Aster89/vimtex,lervag/vimtex,kmarius/vimtex,kmarius/vimtex,Aster89/vimtex,lervag/vimtex