blancco-preferences: run the cloud workflow process

Live 7.15 ran process=auto: it erased unattended but Albus forces
auto_backup off outside workflow/manual ("... not workflow or manual:
Report auto backup must be disabled"), so every report needed a manual
Save to reach the share. 7.20 was set to manual, which honours
auto_backup but waits at "Select devices" (seen on the first real run).

workflow is the only process that both runs unattended (the account's
default MC workflow, workflow default=true, fetched over WiFi) and
auto-backs-up the report ("Start file watcher for auto backup of
workflow process"). Live preferences.xml and config.img updated
(backups .bak-20261005-pre-workflow).

playbook/blancco-preferences.xml

@@ -10,10 +10,10 @@
   <integrity>qJ4hjOqd1NaMbEPsbmaz+8gZlG1duEXinTXI+Wrsc00=</integrity>
   <configuration dect="3.15.0" imported="false">
     <processes type="array" key="process">
-      <process>workflow</process>
+      <process selected="true">workflow</process>
       <process>auto</process>
       <process>semi</process>
-      <process selected="true">manual</process>
+      <process>manual</process>
     </processes>
     <hardware_tests type="array" key="test" enabled="true">
       <test enabled="false" mandatory="false" auto="true" threshold="60">battery</test>