style: Add _OVERRIDE to the style name

This renames HDY_STYLE_PROVIDER_PRIORITY as
HDY_STYLE_PROVIDER_PRIORITY_OVERRIDE to better match its goal.
11 jobs for css-init in 21 minutes and 27 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed #246561
librem5
api-visibility

00:02:21

passed #246563
librem5
build-debian-clang

00:03:23

passed #246562
librem5
build-debian-gcc

00:02:38

passed #246564
librem5
build-fedora-gcc

00:02:51

 
  Test+Docs
passed #246565
librem5
build-gtkdoc

00:02:41

passed #246566
librem5
unit-test

00:02:45

43.2%
 
  Package
passed #246567
librem5
package-debian-buster

00:02:28

passed #246568
librem5:arm64
package-debian-buster:arm64

00:06:32

failed #246569
flatpak allowed to fail
package-flatpak

00:00:47

 
  Test Package
passed #246570
librem5
autopkgtest-debian-buster-package

00:02:25

passed #246571
librem5
lintian-debian-buster-package

00:00:54

 
Name Stage Failure
failed
package-flatpak Package
Committing stage finish to cache
Exporting sm.puri.Handy.Demo to repo
error: Writing content object: min-free-space-percent '3%' would be exceeded, at least 4.1?kB requested
Export failed: Child process exited with code 1
Uploading artifacts...
_build/meson-logs/meson-log.txt: found 1 matching files
WARNING: sm.puri.Handy.Demo-dev.flatpak: no matching files
Uploading artifacts to coordinator... ok
id=246569 responseStatus=201 Created token=EM-Gg2xx
ERROR: Job failed: exit code 1