CI: Remove test git checkout

This will now run on a corrected guix-builder container I manually put in place on the runner.

.gitea/workflows/main.yaml

@@ -6,8 +6,6 @@ jobs:
   Build:
     runs-on: guix
     steps:
-      - name: Tester git checkout
-        run: git clone http://git.home.rekahsoft.ca/${{ gitea.repository }}
       - name: Check out repository code
         uses: https://github.com/actions/checkout@v3
       - name: Build preparation