opengl: gldeinterlace: remove interlace-mode from srcpad's caps
This fixes #475 (closed) . I've been told to set "progressive" value on the "interlace-mode" field if the field exists, but it breaks caps negotiation in my pipeline [deinterlace_test.sh]. Besides, deinterlace element is doing exactly the same: just removes field.
Edited by Eugen Klim