SAPI: Fix seed parameter truncation for LuaPseudoRandom constructor

Also fix a potential seed truncation issue on platforms where the
range of ptrdiff_t (the underlying type of lua_Integer) is too small.

src/script/lua_api/l_noise.cpp

@@ -440,7 +440,7 @@ int LuaPseudoRandom::create_object(lua_State *L)
 {
 	NO_MAP_LOCK_REQUIRED;
 
-	int seed = luaL_checknumber(L, 1);
+	u64 seed = luaL_checknumber(L, 1);
 	LuaPseudoRandom *o = new LuaPseudoRandom(seed);
 	*(void **)(lua_newuserdata(L, sizeof(void *))) = o;
 	luaL_getmetatable(L, className);
@@ -537,8 +537,8 @@ int LuaPcgRandom::create_object(lua_State *L)
 {
 	NO_MAP_LOCK_REQUIRED;
 
-	lua_Integer seed = luaL_checknumber(L, 1);
-	LuaPcgRandom *o  = lua_isnumber(L, 2) ?
+	u64 seed = luaL_checknumber(L, 1);
+	LuaPcgRandom *o = lua_isnumber(L, 2) ?
 		new LuaPcgRandom(seed, lua_tointeger(L, 2)) :
 		new LuaPcgRandom(seed);
 	*(void **)(lua_newuserdata(L, sizeof(void *))) = o;