move-window-to-monitor does not maintain window height

[Damnjelly]

steps to reproduce:

1. Open a window
2. Set window height to a size that is not the maximized size
3. Move window to a separate monitor (move-window-to-monitor-up, move-window-to-monitor-down, move-window-to-monitor-left, and move-window-to-monitor-right all cause this issue)

Expected result: Window maintains height

Actual result: Window height gets set to maximized size

System Information

• niri version: 2024-04-21 (commit 49f5402669012be33f8cd111311c3e39fd4751c0)

• GPU: NVIDIA GeForce RTX 3070

• CPU: Ryzen 5 5600X