Replay controls widget (gui_replay_controls.lua) misbehaves on ultrawide monitors

[ThingsWillCalmUp]

RE: This discussion on discord: https://discord.com/channels/278805140708786177/432874986064052235/1316560761623023638

TL;DR:
The replay controls set the window Y offset based on a value calculated by window width, which causes them to hide beneath the minimap or other elements when ZK is running at ultrawide resolutions.

Someone should probably fix this properly and make the widget able to save its location after being dragged around. For now, I propose the following changes:

gui_replay_controls.lua::L119-120:

	local screenWidth, screenHeight = Spring.GetViewGeometry()
	local windowY = math.floor(screenHeight/8)

This will probably place the widget over the user's playerlist, but it should be draggable from there. Worst case as a dirty hack is to change the window's "right" value to something higher as well, slap it in the middle of the display, and rely on the user to relocate it every time, because it'd at least be somewhere grabbable at that point.