Fix lcd.RGB()

It does not require access to lcd, so let's not check that.

radio/src/lua/api_colorlcd.cpp

@@ -834,9 +834,6 @@ Returns a 5/6/5 rgb color code, that can be used with lcd.setColor
 */
 static int luaRGB(lua_State *L)
 {
-  if (!luaLcdAllowed)
-    return 0;
-
   int r = luaL_checkinteger(L, 1);
   int g = luaL_checkinteger(L, 2);
   int b = luaL_checkinteger(L, 3);