Zooming/dragging plot on a single axis resets the other axis

[YgorSouza]

Describe the bug

When we zoom or drag the plot on a single axis (e.g. with allow_zoom([false, true].into())) the other axis is reset to autobounds.

plot_drag_single_axis.mp4

To Reproduce
Steps to reproduce the behavior:

1. Go to https://www.egui.rs/
2. Open the Plot demo on the charts tab
3. Move the plot away or zoom it
4. Uncheck either X or Y on the "Allow zoom" and/or "Allow drag" options above
5. Try to zoom or drag the plot again. The unchecked axis resets

Expected behavior

When zooming or dragging on only one axis, the other axis should be left alone instead of resetting.

Desktop (please complete the following information):

• OS: Fedora 39
• Browser Firefox
• Version 124