Arch Linux

Description:
Many electron applications on Wayland require additional flags to run in wayland mode and not in xwayland.
For example this is needed to avoid blurriness caused by xwayland when gnome user set fractional scaling in their system.

Since there is no way to contribute to [arch obsidian package repo](https://gitlab.archlinux.org/archlinux/packaging/packages/obsidian/-/blob/main/obsidian.sh?ref_type=heads), somebody please update `obsidian.sh` to this:
```
#!/bin/bash

XDG_CONFIG_HOME=${XDG_CONFIG_HOME:-~/.config}

# Allow users to override command-line options
if [[ -f $XDG_CONFIG_HOME/obsidian-flags.conf ]]; then
OBSIDIAN_USER_FLAGS="$(sed 's/#.*//' $XDG_CONFIG_HOME/obsidian-flags.conf | tr '\n' ' ')"
fi

# Launch
exec /bin/electron /usr/lib/obsidian/app.asar "$@" $OBSIDIAN_USER_FLAGS
```

This is done in some packages already (e.g. [extra/code](https://gitlab.archlinux.org/archlinux/packaging/packages/code/-/blob/1.83.1-1/code.sh?ref_type=tags), [aur/youtube-music](https://aur.archlinux.org/cgit/aur.git/tree/youtube-music.sh?h=youtube-music), [aur/code](https://aur.archlinux.org/cgit/aur.git/tree/visual-studio-code-bin.sh?h=visual-studio-code-bin)) and it works fine.

Would be great to have that for obsidian!