Lua: fix SetHandGraphic and DeadCreaturesReturnToPool (#4856)

Author: PieterVdc

src/lua_api.c

@@ -179,7 +179,7 @@ static int lua_Creature_available(lua_State *L)
 
 static int lua_Dead_creatures_return_to_pool(lua_State *L)
 {
-    TbBool return_to_pool         = lua_toboolean(L, 3);
+    TbBool return_to_pool         = lua_toboolean(L, 1);
     set_flag_value(game.mode_flags, MFlg_DeadBackToPool, return_to_pool);
     return 0;
 }
@@ -1784,7 +1784,7 @@ static int lua_Set_music(lua_State *L)
 static int lua_Set_hand_graphic(lua_State *L)
 {
     PlayerNumber player_idx = luaL_checkPlayerSingle(L, 1);
-    long hand_idx = luaL_checkNamedCommand(L,1,powerhand_desc);
+    long hand_idx = luaL_checkNamedCommand(L,2,powerhand_desc);
 
     struct PlayerInfo * player = get_player(player_idx);
     player->hand_idx = hand_idx;