Fix: egs-sync path field is always disabled

[arielj]

We have the logic backwards, it should be editable when NOT isSyncing (current logic makes it always disabled cause isSyncing starts as false)

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• Tested the feature and it's working on a current and clean install.
• 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)