Build on default queue, not whopper

Reverts mysql#11.

Author: piki

.buildkite/pipeline.yml

@@ -12,8 +12,6 @@ env:
 steps:
   - name: "Build mysql-server"
     label: ":docker: Build and package"
-    agents:
-      queue: "whopper"
     command: bash build.sh
     artifact_paths:
       - "dist/*.tar.gz"