fix: add default path for crossover on macOS

[WangEdward]

If user disabled Spotlight, mdfind will not work. /Applications/CrossOver.app is the default install location for CrossOver, therefore adding it here as a backup.

Fixes #3025

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Use the following Checklist if you have changed something on the Backend or Frontend:

• [x] Tested the feature and it's working on a current and clean install.
• [x] Tested the main App features and they are still working on a current and clean install. (Login, Install, Play, Uninstall, Move games, etc.)
• [ ] Created / Updated Tests (If necessary)
• [ ] Created / Updated documentation (If necessary)