Windows: Fix build error due to missing definition of Texture2D

[RandomShaper]

For some reason, now I'm getting a compile error about Texture2D being an incomplete type when used in DisplayServerWindows::create_status_indicator(). This is a cure.

[akien-mga]

That's correct. In the header it's forward-declared by way of including servers/display_server.h, so each display server implementation is responsible for including it if they implement one of the APIs that use Texture2D.

[akien-mga]

Thanks!