webrtc: Replace is_desktop_linux with is_linux

`is_desktop_linux` is the same as `is_linux` now and will be deprecated

Bug: chromium:1132395
Change-Id: If3746da85558d20a0c321357c8dd3bcadfee7a9b
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/186424
Reviewed-by: Henrik Andreassson <[email protected]>
Reviewed-by: Mirko Bonadei <[email protected]>
Commit-Queue: Xiaohan Wang <[email protected]>
Cr-Commit-Position: refs/heads/master@{#32318}

Author: Xiaohan Wang

webrtc.gni

@@ -112,7 +112,7 @@ declare_args() {
   # By default it's only enabled on desktop Linux (excludes ChromeOS) and
   # only when using the sysroot as PipeWire is not available in older and
   # supported Ubuntu and Debian distributions.
-  rtc_use_pipewire = is_desktop_linux && use_sysroot
+  rtc_use_pipewire = is_linux && use_sysroot
 
   # Set this to link PipeWire directly instead of using the dlopen.
   rtc_link_pipewire = false