Rename `timelessP` into `timelessP`.

This was an oversight in !63.
6 jobs for master in 20 minutes and 43 seconds
Status Job ID Name Coverage
  Build
passed #6996
fp-timing
build-coq.8.6.1

00:06:56

passed #6995
fp-timing
build-coq.8.7.1

00:03:03

 
  Deploy
passed #6997
opam

00:00:15

passed #6998
reverse-deps

00:00:16

 
  Build More
passed #7000
fp-timing
build-coq.8.7.0

00:06:48

passed #6999
fp-timing
build-coq.8.7.dev

00:07:12