- BKE_mask_update_scene was only used with do_newframe=FALSE,
removed this argument.
- Made it so BKE_mask_update_scene is able to handle LIB_ID_RECALC_DATA
case. Namely, if mask ID is tagged for data update it means shapekeys
will be re-evaluated (as if do_newframe=true).
If mask id only tagged for LIB_ID_RECALC, then no shapekey evaluation
happens (same as it used to behave before).
This means, doing DAG_id_tag_update(&mask->id, OB_RECALC_DATA) will
lead to shapekeys re-evaluation which is really needed in such
operators as clearing shapekeys (and cleaning shapekeys which is
in tomato branch yet).
This is a bit silly to use OB_RECALC_DATA sine mask is not an OB,
but could not see better way to do it now.
This fixes missing mask re-evaluation after clearing shapekey,
would expect no other functional changes.