switch from head to tail

from @relrod

`head` will close the input fd when it no longer needs it (or exits). find will try to write to the closed fd and somewhere along the way, it will receive SIGPIPE as a result. This is why `yes | head -5 ` doesn't run forever.

awx/playbooks/project_update.yml

@@ -26,7 +26,7 @@
   name: Update source tree if necessary
   tasks:
     - name: Delete project directory before update
-      ansible.builtin.shell: set -o pipefail && find . -delete -print | head -2  # volume mounted, cannot delete folder itself
+      ansible.builtin.shell: set -o pipefail && find . -delete -print | tail -2  # volume mounted, cannot delete folder itself
       register: reg
       changed_when: reg.stdout_lines | length > 1
       args: