✏️ host: pottwal: Fix misleading task name

Looks like a copy'n'paste mistake.  Improve the other task name while at
it.

Fixes: 88e14f7ca6 ("👌 pottwal: Move prosody config to /etc")

host-pottwal.yml

@@ -184,7 +184,7 @@
         msg: "prosody data dir is missing, please restore from the backup!"
       when: not prosody_dir.stat.exists
 
-    - name: Ensure prosody config dir exists
+    - name: Ensure prosody main config dir exists
       ansible.builtin.file:
         path: "{{ prosody_config_dir }}"
         state: directory
@@ -204,7 +204,7 @@
         state: directory
         mode: 0755
 
-    - name: Ensure prosody certs dir exists
+    - name: Ensure prosody conf.d dir exists
       ansible.builtin.file:
         path: "{{ prosody_config_dir }}/conf.d"
         state: directory