ci: re-enable sort.py

It was disabled on commit df6ea88 ("merges, disable sort.py in profile
checks temporarely, two more private-etc profiles", 2023-02-14).

Currently all profiles are sorted and there are no ongoing `private-etc`
changes, so it should be safe to re-enable.

Note that the script is useful to catch sorting issues not only in
`private-etc` but also in other commands, such as `seccomp`[1] [2].

This is a follow-up to netblue30#6070.

Relates to netblue30#5610.

[1] netblue30#6066 (comment)
[2] netblue30#6067 (comment)

.github/workflows/check-profiles.yml

@@ -43,10 +43,10 @@ jobs:
       run: ./ci/printenv.sh
     - run: python3 --version
 
-#   - name: sort.py
-#     run: >
-#       ./ci/check/profiles/sort.py
-#       etc/inc/*.inc etc/{profile-a-l,profile-m-z}/*.profile
+   - name: sort.py
+     run: >
+       ./ci/check/profiles/sort.py
+        etc/inc/*.inc etc/{profile-a-l,profile-m-z}/*.profile
 # Currently broken (see #5610)
 #   - name: private-etc-always-required.sh
 #     run: >