chromium: Enable Ozone's DRM/GBM platform [0]

We've only set ozone_platform_gbm=false to fix the build with Mesa's
libgbm (vs. Google's own minigbm). However, since this issue has
resolved itself we can now drop it. Building with the recommended
settings should also avoid some issues (e.g. #104885).

[0]: https://chromium.googlesource.com/chromium/src.git/+/master/docs/ozone_overview.md#drm_gbm

pkgs/applications/networking/browsers/chromium/common.nix

@@ -263,7 +263,6 @@ let
       link_pulseaudio = true;
     } // optionalAttrs useOzone {
       use_ozone = true;
-      ozone_platform_gbm = false;
       use_xkbcommon = true;
       use_glib = true;
       use_gtk = true;