[luksbootkeyfile] Refactor static function to outside class

src/modules/luksbootkeyfile/LuksBootKeyFileJob.cpp

@@ -66,18 +66,6 @@ struct LuksDevice
     QString passphrase;
 };
 
-struct LuksDeviceList
-{
-    LuksDeviceList( const QVariant& partitions )
-        : valid( false )
-    {
-        if ( partitions.canConvert< QVariantList >() )
-        {
-            devices = getLuksDevices( partitions.toList() );
-            valid = true;
-        }
-    }
-
 /** @brief Extract the luks passphrases setup.
  *
  * Given a list of partitions (as set up by the partitioning module,
@@ -103,6 +91,18 @@ struct LuksDeviceList
     return luksItems;
 }
 
+struct LuksDeviceList
+{
+    LuksDeviceList( const QVariant& partitions )
+        : valid( false )
+    {
+        if ( partitions.canConvert< QVariantList >() )
+        {
+            devices = getLuksDevices( partitions.toList() );
+            valid = true;
+        }
+    }
+
     QList< LuksDevice > devices;
     bool valid;
 };