HSpaceS1: move Univalence assumption to just where needed #3878

Job	Run time
quick-build (dev, ubuntu-latest)	3m 23s
build (dev, --warnings)	3m 39s
opam-build (latest, ubuntu-latest)	4m 50s
nix	2m 17s
opam-build (supported, ubuntu-latest)	4m 31s
build (supported)	3m 36s
opam-build (dev, ubuntu-latest)	4m 16s
quick-build (latest, ubuntu-latest)	3m 36s
build (latest)	3m 20s
quick-build (supported, ubuntu-latest)	3m 35s
doc-coqdoc	1m 46s
doc-dep-graphs	7m 56s
coqchk (dev)	2m 12s
doc-timing	1m 52s
install (supported)	1m 54s
doc-alectryon	15m 6s
coqchk (latest)	2m 15s
coqchk (supported)	2m 4s
install (latest)	1m 42s
install (dev)	1m 31s
deploy-doc	0s
delete-artifacts	11s
	1h 15m 32s

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