This showed a confusing message when the trash path was able to be
deleted using sudo since the untrashable array was updated but
the check was higher up for returning early.
```
==> Trashing files:
/Users/Shared/Maxon
/Users/Shared/Red Giant
~/Library/Application Support/Maxon
~/Library/Application Support/Red Giant
~/Library/Caches/net.maxon.app-manager
~/Library/Preferences/Maxon
~/Library/Preferences/net.maxon.app-manager.plist
~/Library/Saved Application State/net.maxon.app-manager.savedState
==> Using sudo to gain ownership of path '/Users/Shared/Maxon'
==> Using sudo to gain ownership of path '/Users/Shared/Red Giant'
Warning: The following files could not be trashed, please do so manually:
==> Removing all staged versions of Cask 'maxon'
```
The warning about files not getting trashed should only be shown if
some files didn't get trashed.
Fixes https://github.com/Homebrew/brew/issues/18901
ebede56314