efl_gfx_path: Add optimized path command

Summary:
If 'L' is removed due to optimization, it should be supported like 3b1f7be
If the previous command is 'M', use 'L'.

Test Plan: N/A

Reviewers: Hermet, smohanty, kimcinoo

Reviewed By: Hermet

Subscribers: cedric, reviewers, committers

Tags: efl

Differential Revision: https://phab.enlightenment.org/D10104