pipewire: get rid of all ? null since nix is lazy

pkgs/development/libraries/pipewire/default.nix

@@ -28,29 +28,29 @@
 , callPackage
 , nixosTests
 , withValgrind ? lib.meta.availableOn stdenv.hostPlatform valgrind
-, valgrind ? null
+, valgrind
 , withMediaSession ? true
 , libcameraSupport ? true
 , libcamera
 , libdrm
 , gstreamerSupport ? true
-, gst_all_1 ? null
+, gst_all_1
 , ffmpegSupport ? true
-, ffmpeg ? null
+, ffmpeg
 , bluezSupport ? true
-, bluez ? null
+, bluez
-, sbc ? null
+, sbc
-, libfreeaptx ? null
+, libfreeaptx
-, ldacbt ? null
+, ldacbt
-, fdk_aac ? null
+, fdk_aac
 , nativeHspSupport ? true
 , nativeHfpSupport ? true
 , ofonoSupport ? true
 , hsphfpdSupport ? true
 , pulseTunnelSupport ? true
-, libpulseaudio ? null
+, libpulseaudio
 , zeroconfSupport ? true
-, avahi ? null
+, avahi
 }:
 
 let