update winget command

[kszkristof]

Some guy uploaded an app to the Microsoft Store that conflicts with "heroic", so winget now just says that "Multiple packages found matching input criteria. Please refine the input." if you enter winget install heroic. I've edited the readme so that it has the whole "HeroicGamesLauncher.HeroicGamesLauncher" package name in it that works.
Example: https://i.imgur.com/VaRH1R2.png

<--- Put the description here --->

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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]

Thanks for catching that!