Missing transforms on compose_index_maps in DirectDiscretizationConnection

[inducer]

See this FIXME:

meshmode/meshmode/discretization/connection/direct.py

Lines 126 to 132 in e179d35

	# FIXME: Current arraycontext (2021-06-17, 9e5fb5d) does not map
	# the iel_init iname to a GPU axis, leading this kernel to likely
	# be very slow. Fortunately, this should only run during
	# problem setup.
	#
	# cf. https://github.com/inducer/arraycontext/pull/29
	# for a strategy that could/should be used instead.

Left over from #220.

x-ref: inducer/arraycontext#29, 03d883a

cc @matthiasdiener @thomasgibson