[Fix] Protocol handling on Windows

[CommandMC]

When creating a shortcut, Windows automatically adds a trailing / to the path. This caused Heroic to assume its parsing the old-style protocol URL, while it was actually getting a new-style one. Because of this, shortcuts created on Windows since Heroic 2.16 wouldn't actually work

Note that this is a change on the handling side, meaning previously-non-working shortcuts will now just work again

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

• 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)

[flavioislima]

lgtm