gstregistry: Don't look for plugins under 'debug' anymore
Submitted by Nirbheek Chauhan
Link to original bug (#797336)
Description
Originally, this was used in 2014 when we had the vcxproj files:
https://bugzilla.gnome.org/show_bug.cgi?id=679115
but don't create this directory structure with the meson build files,
so this just leads to plugins not being found if GStreamer is built
with the debug CRT.