Fixed a bug when reloading the script while in use.
(Thanks to user Suslik V. See https://obsproject.com/forum/threads/corner-pin.153775/post-573120)
Fix a bug when the filter is applied to a video capture source set to deactivate when not shown. If the video capture source was cropped, the bug prevented the source from displaying when it was reactivated.
I modified the source code so the filter-cornerpin.effect file is no longer needed. The shader is now included in the filter-cornerpin.lua file.