refactor(partitioning): remove unused register variables

roles/partitioning/tasks/_setup_luks.yml

@@ -21,7 +21,6 @@
           algorithm: "{{ system_cfg.luks.pbkdf }}"
           iteration_time: "{{ (system_cfg.luks.iter | float) / 1000 }}"
         passphrase: "{{ system_cfg.luks.passphrase | string }}"
-      register: partitioning_luks_format_result
       no_log: true
 
     - name: Force-close LUKS mapper
@@ -51,7 +50,6 @@
             name: "{{ system_cfg.luks.mapper }}"
             passphrase: "{{ system_cfg.luks.passphrase | string }}"
             allow_discards: "{{ 'discard' in (system_cfg.luks.options | lower) }}"
-          register: partitioning_luks_open_result
           no_log: true
       rescue:
         - name: Force-close stale LUKS mapper
@@ -79,7 +77,6 @@
             name: "{{ system_cfg.luks.mapper }}"
             passphrase: "{{ system_cfg.luks.passphrase | string }}"
             allow_discards: "{{ 'discard' in (system_cfg.luks.options | lower) }}"
-          register: partitioning_luks_open_retry
           no_log: true
 
     - name: Get LUKS UUID