Fix luacheck after d9cc3af2

frontend/ui/data/onetime_migration.lua

@@ -289,8 +289,8 @@ end
 -- 20210720, Reset all user's duration time to classic, https://github.com/koreader/koreader/pull/8008
 if last_migration_date < 20210720 then
     logger.info("Performing one-time migration for 20210720")
-    -- With PR 7897 and migration date 20210629, we migrated everyone's duration format to the combined setting. 
-    -- However, the footer previously defaulted to "modern", so users who were used to seeing "classic" in the UI 
+    -- With PR 7897 and migration date 20210629, we migrated everyone's duration format to the combined setting.
+    -- However, the footer previously defaulted to "modern", so users who were used to seeing "classic" in the UI
     -- started seeing the modern format unexpectedly. Therefore, reset everyone back to classic so users go back
     -- to a safe default. Users who use "modern" will need to reselect it in Time and Date settings after this migration.
     G_reader_settings:saveSetting("duration_format", "classic")