[WORKAROUND]: run physxlegacy setup without user input

[imLinguin]

As we noticed in Heroic-Games-Launcher/known-fixes#7
the PHYSXLEGACY setup doesn't have a silent switch, or at least it doesn't respect it.

I came up with this simple solution, it should make the experience more hands free.

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)

[arielj]

Works as expected. Tested with Empire Earth 3 with and without this change.

With this change physx legacy is installed silently.

[flavioislima]

LGTM!

Not sure if this could be called a hack, you are just adapting the command to what the dependency needs.

If was the case that we would need to handle several more dependencies with different commands then we could use a mapping object for it.

For me this is just a normal fix and I would remove the Hack commend before merging.
But I will leave it up to you 👍🏽

[imLinguin]

Maybe a workaround is better suited for this

[flavioislima]

Maybe a workaround is better suited for this

if you think about it, the whole Heroic is a 'workaround' or 'hack' to play the games without the official launchers 😂

[imLinguin]

Maybe... but here we are branching out from the standard way even more 😄