chromiumBeta: Fix the build

The build argument `use_system_libwayland_server` was set to `false`
since M107 [0]. This will cause `libwayland` to be built which does in
turn pull in `libffi` ("//build/config/linux/libffi") [1].

Alternatively, we should be able to fix the libffi dependency by setting
`use_system_libffi = true` (recently added, see [2]) and adding `libffi`
to the build inputs.

[0]: b9cd6d6767
[1]: https://source.chromium.org/chromium/chromium/src/+/refs/tags/107.0.5304.62:third_party/wayland/BUILD.gn
[2]: cf3ee09f08

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

@@ -296,6 +296,7 @@ let
     } // optionalAttrs (chromiumVersionAtLeast "107") {
       clang_base_path = "${llvmPackages.clang}";
       use_qt = false;
+      use_system_libwayland_server = true;
     } // optionalAttrs proprietaryCodecs {
       # enable support for the H.264 codec
       proprietary_codecs = true;