Fix formatting of prebuilt rooms

src/map_builders/prefab_builder/prefab_rooms.rs

@@ -39,9 +39,9 @@ pub const SILLY_SMILE: PrefabRoom = PrefabRoom {
 const SILLY_SMILE_MAP: &str = "
       
  ^  ^ 
-   #  
+  ##  
       
-  ### 
+ #### 
       
 ";
 
@@ -57,6 +57,7 @@ pub const CHECKERBOARD: PrefabRoom = PrefabRoom {
 #[allow(dead_code)]
 const CHECKERBOARD_MAP: &str = "
       
+ #^#  
  g#%# 
  #!#  
  ^# #