CI: shorten the notification stanzas

.github/workflows/ci-neon.yml

@@ -82,17 +82,14 @@ jobs:
         uses: rectalogic/notify-irc@v1
         if: ${{ success() }}
         with:
-          server: chat.freenode.net
           channel: "#calamares"
-          nickname: gh-notify
           message: "${{ github.workflow }} OK ${{ github.repository }} ${{ steps.pre_build.outputs.message }}"
       - name: "notify: fail"
         uses: rectalogic/notify-irc@v1
         if: ${{ failure() }}
         with:
-          server: chat.freenode.net
           channel: "#calamares"
-          nickname: gh-notify
           message: |
             ${{ github.workflow }} FAIL ${{ github.repository }} ${{ steps.pre_build.outputs.message }}
             .. DIFF ${{ github.event.compare }}
+# END