gst_all_1.gst-plugins-bad: add missing lcms2 depend

Without the change build fails as:

> Run-time dependency pangocairo found: YES 1.50.8
> Run-time dependency lcms2 found: NO (tried pkgconfig)
>
> ext/colormanagement/meson.build:1:0: ERROR: Dependency "lcms2" not found, tried pkgconfig

pkgs/development/libraries/gstreamer/bad/default.nix

···
 , libkate
 , lrdf
 , ladspaH
+, lcms2
 , libnice
 , webrtc-audio-processing
 , webrtc-audio-processing_1
···
     gst-plugins-base
     orc
     json-glib
+    lcms2
     ldacbt
     libass
     libkate