discord: fix to find updater_bootstrap

[Techno263]

Testing the changes

• I tested the changes in this PR: YES

Local build testing

• I built this PR locally for my native architecture, x86_64-glibc

[Duncaen]

Can you explain why each change is needed?

[Techno263]

I'm not sure how this is working for others, but when I launch discord through the /usr/bin/discord symlink the executed script fails because it cant find updater_bootstrap.

When trying to find updater_bootstrap it checks three places: /usr/share/discord/updater_bootstrap, /opt/discord/updater_bootstrap, and $(dirname -- "$0")/updater_bootstrap. When launching through the symlink the last path resolves to /usr/bin/updater_bootstrap and fails. If the symlinks real path is gotten before calling dirname the final path will be /usr/lib/discord/updater_bootstrap. Which finds updater_bootstrap and executes successfully.

[Techno263]

The symlink change in the template is because the discord application filename capitalization changed in the 1.0 release; from Discord to discord. On my system the symlink with a capital D is broken because of that.

[Techno263]

I'm guessing others maybe using the desktop entry to launch discord, but I am puzzled how the Exec=/usr/bin/discord part of it runs successfully.

Edit: nevermind, I was looking at the desktop entry discord releases. I forgot the Exec entry gets patched when packaging.