The "exit()" function causes CopyQ to lose its window position

In CopyQ v6.3.0, the `exit()` function results in CopyQ losing its window position.

STR:
1. Launch CopyQ
2. Open the main CopyQ window
3. Move the CopyQ window to the lower-right corner of the monitor
4. From the shell, execute `copyq showat 1 1` (or use an external command to move the CopyQ window to that position)
5. Open the main CopyQ window
6. Notice the CopyQ window is positioned at the upper-left corner of the monitor, as expected
7. Close the CopyQ window
8. From the shell, execute `copyq exit`
9. Launch CopyQ
10. Open the main CopyQ window
11. Notice the CopyQ window is no longer positioned at the upper-left corner of the monitor