Viewport icons not working

## Version of Dear PyGui

Version: 1.9.1
Operating System: MacOS 13.2.1

## My Issue/Question

Setting viewport icons has no effect and the icons don't show up.

## Standalone, minimal, complete and verifiable example
```
import dearpygui.dearpygui as dpg

dpg.create_context()
dpg.create_viewport(title='Custom Title', width=600, height=400)
dpg.setup_dearpygui()

with dpg.window(label="tutorial"):
dpg.add_button(label="Press me")

dpg.set_viewport_small_icon("/Users/tomasantunes/Documents/python-scripts/test3/icon1.png")
dpg.set_viewport_large_icon("/Users/tomasantunes/Documents/python-scripts/test3/icon2.png")

dpg.show_viewport()
dpg.start_dearpygui()
dpg.destroy_context()
```