xrt: clang-format workaround fix
It appears that different versions of clang-format
format the struct-init macros differently, with
newer versions making them inlined/one-liners
This commit applies the formatting of the newer
versions and disables formatting to prevent
older versions re-formating them back to
the old way.
Part-of: <https://gitlab.freedesktop.org/monado/monado/-/merge_requests/2510>