Adding `%I` to printing of proof mode hypotheses.

We already do the same for the goal, this avoids some scope
delimiters being displayed.
4 jobs for gen_proofmode in 16 minutes (queued for 3 seconds)
Status Job ID Name Coverage
  Build
passed #14206
fp
build-coq.8.7.1

00:04:53

passed #14205
fp
build-coq.8.7.2

00:04:56

passed #14204
fp-timing
build-coq.8.8.0

00:04:31

passed #14203
fp
build-coq.dev

00:16:00