Remove gog-galaxy

It requires Rosetta which I'd rather not have to install. Not necessary to keep this cask so we can remove it.

```
Installing gog-galaxy
==> Caveats
gog-galaxy is built for Intel macOS and so requires Rosetta 2 to be installed.
You can install Rosetta 2 with:
  softwareupdate --install-rosetta --agree-to-license
Note that it is very difficult to remove Rosetta 2 once it is installed.

==> Downloading https://cdn.gog.com/open/galaxy/client/2.0.74.336/galaxy_client_2.0.74.336.pkg
==> Installing Cask gog-galaxy
==> Running installer for gog-galaxy with sudo; the password may be necessary.
installer: This package requires Rosetta 2 to be installed.
                Please install Rosetta 2 and then try again.
                    `sudo softwareupdate --install-rosetta`

installer: Error - GOG Galaxy 2.0 can’t be installed on this computer.
==> Purging files for version 2.0.74.336 of Cask gog-galaxy
Installing gog-galaxy has failed!
```

Caskfile

@@ -11,7 +11,6 @@ cask 'gb-studio'
 cask 'gdevelop'
 cask 'git-credential-manager'
 cask 'github'
-cask 'gog-galaxy'
 cask 'google-chrome'
 cask 'microsoft-edge'
 cask 'openemu'