Fix Sprite2D dialog size for smaller screen device

[shahriarlabib000]

So my editor scale was 180% by default

Before

Now

[WhalesState]

I feel like we should change window size instead of the Control's minimum size, and we leave the minimum size to be calculated automatically, to avoid such limitation.

Since if you scale the UI by 200%, you will need to make another fix to fit your screen.

[shahriarlabib000]

I have no idea how to do that. Could you pls review and suggest the change pls

[shahriarlabib000]

The easiest solution would be to set the minimum size height even lower 😅 (im joking)

[shahriarlabib000]

This went horribly

https://github.com/shahriarlabib000/godot/blob/3b60ec132b4cf9872b69b91a52fa2cebf2644894/editor/plugins/sprite_2d_editor_plugin.cpp#L601-#L602

	debug_uv->set_size(Size2(800, 400) * EDSCALE);
//	debug_uv->set_custom_minimum_size(Size2(800, 500) * EDSCALE);