Blender Git Loki

VSE: Fix assigning effect strip inputs

Partialy fixes T73828

Currently all 3 effect inputs were assigned even if not all 3 were used.
This causes problems with reassigning effects in python, because 3rd input is
not accessible.

This patch will only assign inputs that are necessary for effect to work
properly.

Reviewed By: campbellbarton

Differential Revision: https://developer.blender.org/D6868