ci macos: remove test lines

.github/workflows/main.yml

@@ -10,8 +10,6 @@ jobs:
 
     steps:
     - uses: actions/checkout@v1
-    - name: test getting the git branch of the triggering ref 
-      run: echo ${GITHUB_REF##*/}
     - name: Install dependencies
       run: brew install gtk+3 gtkmm3 gtk-mac-integration adwaita-icon-theme libsigc++ little-cms2 libiptcdata fftw lensfun llvm expat pkgconfig libomp
     - name: cmake