Always remember the last window size and position

[mikayla-maki]

make new runs of zed always match the window of the previous run of Zed, even if it's not the same workspace

fixes #5258

Release Notes:

• Zed will always open new windows with the same position and location as the previous instance of Zed.

[dhunter]

Not sure if actually fixed #5258, where there's still conversation about, (and which has also spawned #17870) at least on Linux, (X11) where Zed is still opening in a different position and with a different size and shape. I know at least for Linux, for people using Wayland instead of X11 it may or may not even be possible to retain / re-open in the same position, but same size and shape should be achievable, (i.e. VSCodium - open source fork of VSCode - does retain size and shape).