Revert "shell/window-tracker: Exclude screen recorder window"

Revert "shell/window-tracker: Exclude screen recorder window"

This reverts commit 575ba13b9b4efa40f07d57d87d50d8f0466f2e16.

That commit did not actually prevent the "Unknown" application from
showing up in the dash or app switcher when the recorder was running,
but it introduced a problem with Proton which also uses gstreamer OpenGL
elements in its transcoder. This was causing the overview to get stuck
while the transcoder was running due to the app for the
"OpenGL Renderer" window being null.

Closes: https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/7042
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/3000>
(cherry picked from commit bf742c39262f6f250c39fb97ab74edb5192989f9)