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ARROW-16141: [R] Update rhub/fedora-clang-devel for upstreamed changes (#12824)

In ARROW-15857 (#12734) we fixed the nightly failures on rhub/fedora-clang-devel by a kludge modifying the default makefile, but also upstreamed the fixes (https://github.com/rstudio/sass/pull/104 and https://github.com/r-hub/rhub-linux-builders/pull/60). These upstreams are now both released, so we can remove the kludge from modification of the docker image.

Lead-authored-by: Dewey Dunnington <dewey@voltrondata.com>
Co-authored-by: Dewey Dunnington <dewey@fishandwhistle.net>
Signed-off-by: Dewey Dunnington <dewey@fishandwhistle.net>