Recording issues when changing filters on the fly.

[eugene-s-nesdev]

step-by-step:

1. start emu with no filter / no shader
2. set any video rec profile (H264/high/960x720 for example)
3. try to record video - it will record correctly
4. change filter to something else, like paltv 2x
5. try to record video again - punes will record audio stream only.
6. close emulator, then start it again - and video will record correctly

tested on win64-d3d9 build (commit https://github.com/punesemu/puNES/commit/4084bf80b5ad067b53f3cc1bbe27de67c3abf248) under win10