Scale factor of window on fullscreen secondary monitor is read as main monitor's scaling factor

**Problem**

The scale factor of a fullscreen window on secondary monitor is read as the scale factor as the main monitor unless `.with_position()` is set explicitly in the window configuration.

**Steps To Reproduce**

1. Have two monitors with different scaling factors
2. Launch the Dioxus desktop app with fullscreen enabled on the secondary monitor but without calling `.with_position()`.
3. Attempt to read the window’s scale factor.
4. Observe incorrect scale factor values

**Expected behavior**

The application should be able to read the correct window scale factor even without explicitly setting the position when launching fullscreen.

**Workaround**

See my commit showing the workaround:
https://github.com/odysseyarm/odyssey-desktop/compare/c44572055486...340ed49d436d

**Environment:**

- Dioxus version: v0.7.0-alpha-1
- OS info: Windows 11
- App platform: desktop (Dioxus desktop)