Desktop: Fixes #8240: Fix print on Linux

[personalizedrefrigerator]

Summary

Fixes File > Print on Linux by using window.print() instead of webContents.print. (Fixes #8240).

Notes

• The app crashes if we close the window used for printing too quickly after printing completes (see [Bug]: Closing Electron Window printing the PDF causes SIGSEGV electron/electron#31635). Thus, a 1 second timeout has been added.
• On Linux, some print settings will not be applied (e.g. portrait vs landscape). It should be possible to apply these settings using an @page CSS rule.

Note

For now, this pull request is partly intended for discussion. The current approach works around what seem to be two Electron bugs. An alternative approach would be to

1. Print to PDF
2. Show that PDF in a window labelled "print preview" (as suggested here)

Testing plan

1. Create notes with the following contents:
   1. A very long note (I used this book from Project Gutenberg)
   2. A note with math (KaTeX) and at least one image
2. Print both to files and verify that the files have the expected content.

This has been tested successfully on Ubuntu 23.10. (Untested on Windows/MacOS).