Lacros: Stop setting use_cras=false for fishfood builds.

It's no longer necessary as cras is now functional with Lacros.

Change-Id: I28e35a9d2f9865cec30847d5aec44de007120d05
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2367797
Commit-Queue: Erik Chen <erikchen@chromium.org>
Commit-Queue: Yuke Liao <liaoyuke@chromium.org>
Auto-Submit: Erik Chen <erikchen@chromium.org>
Reviewed-by: Yuke Liao <liaoyuke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800343}

tools/mb/mb_config.pyl

@@ -2413,7 +2413,7 @@
     },
 
     'amd64-lacros': {
-      'gn_args': 'use_ozone=true ozone_platform_wayland=true ozone_platform_x11=false target_os="linux" use_cras=false use_evdev_gestures=false use_vaapi=false use_gtk=false use_glib=false enable_linux_installer=false rtc_use_pipewire=false use_gio=false use_v8_context_snapshot=false use_custom_libcxx=false use_pulseaudio=false use_pangocairo=false chromeos_is_browser_only=true use_system_libsync=false cros_host_sysroot="//build/linux/debian_sid_amd64-sysroot" cros_v8_snapshot_sysroot="//build/linux/debian_sid_amd64-sysroot" use_custom_libcxx_for_host=true'
+      'gn_args': 'use_ozone=true ozone_platform_wayland=true ozone_platform_x11=false target_os="linux" use_evdev_gestures=false use_vaapi=false use_gtk=false use_glib=false enable_linux_installer=false rtc_use_pipewire=false use_gio=false use_v8_context_snapshot=false use_custom_libcxx=false use_pulseaudio=false use_pangocairo=false chromeos_is_browser_only=true use_system_libsync=false cros_host_sysroot="//build/linux/debian_sid_amd64-sysroot" cros_v8_snapshot_sysroot="//build/linux/debian_sid_amd64-sysroot" use_custom_libcxx_for_host=true'
     },
 
     # We build Android with codecs on most bots to ensure maximum test