CMake: Fix spelling mistake

"Install CMake package configiguration module" --> configuration

Signed-off-by: Daniel Engberg <daniel.engberg.lists@pyret.net>
Signed-off-by: Ralph Giles <giles@thaumas.net>
2 jobs for master in 48 seconds (queued for 1 second)
Status Name Job ID Coverage
  Build
passed autoconf #11650
docker

00:00:48

passed cmake #11651
docker

00:00:18