Apply suggestions from code review

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: Lash-L

README.md

@@ -32,7 +32,7 @@ If your map is displayed sideways or upside down, you can rotate the map directl
 
 This integration provides a **Select entity per map** to control rotation:
 - `select.<...>_rotation`
-- Options: `No rotation`, `Rotate 90°`, `Rotate 180°`, `Rotate 270°` (labels depend on your HA language)
+- Options: `0°`, `90°`, `180°`, `270°` (labels depend on your HA language)
 
 This rotates **both**:
 - the map image

custom_components/roborock_custom_map/__init__.py

@@ -24,7 +24,6 @@ def unload_this_entry() -> None:
     for r_entry in roborock_entries:
         if r_entry.state == ConfigEntryState.LOADED:
             coordinators.extend(r_entry.runtime_data.v1)
-            
             r_entry.async_on_unload(unload_this_entry)
 
     if not coordinators: