Fixed error when shifting Pokémon at the end of a battle round, fixed Giratina's form code crashing if the current map doesn't have metadata, fixed item sell prices being halved twice

Data/Scripts/014_Pokemon/001_Pokemon-related/001_FormHandlers.rb

@@ -260,8 +260,7 @@ MultipleForms.register(:ROTOM, {
 MultipleForms.register(:GIRATINA, {
   "getForm" => proc { |pkmn|
     next 1 if pkmn.hasItem?(:GRISEOUSORB)
-    if $game_map &&
-       GameData::MapMetadata.get($game_map.map_id)&.has_flag?("DistortionWorld")
+    if $game_map && $game_map.metadata&.has_flag?("DistortionWorld")
       next 1
     end
     next 0