ardour: Enable video support by default

Enables video support in ardour by default.

I do a lot of sound design using ardour and in turn have it enabled in
my configuration. However, seeing as hydra only builds the default
configuration, the build I need is never cached, and I always end up
needing to build ardour from scratch which takes over an hour on my
small laptop. The `videoSupport` flag itself just ensures that xjadeo
and harvid (both required for video support to work in ardour) are
accessible via the PATH.

pkgs/applications/audio/ardour/default.nix

@@ -52,7 +52,7 @@
 , vamp-plugin-sdk
 , wafHook
 , xjadeo
-, videoSupport ? false
+, videoSupport ? true
 }:
 stdenv.mkDerivation rec {
   pname = "ardour";