Keep running CodeQL on all branches, etc.

This restores three aspects of the previous `codeql.yml`:

- Run it on all branches, not just `main`.

- Run it on the previous schedule rather than the new one, since
  there's no reason to change the schedule (though there's no
  reason to be attached to the old schedule either).

- Use "CodeQL" rather than "CodeQL Advanced" as the workflow
  `name`, since this takes up less horizontal space when reading
  the reports from the checks.

Of these, only the first is really significant.

Author: EliahKagan

.github/workflows/codeql.yml

@@ -9,15 +9,13 @@
 # the `language` matrix defined below to confirm you have the correct set of
 # supported CodeQL languages.
 #
-name: "CodeQL Advanced"
+name: "CodeQL"
 
 on:
   push:
-    branches: [ "main" ]
   pull_request:
-    branches: [ "main" ]
   schedule:
-    - cron: '36 18 * * 0'
+    - cron: '27 10 * * 3'
 
 jobs:
   analyze: