Fix getGameInfo and prefix when uninstalling

[arielj]

I started fixing the uninstall dialog but it actually fixes two issues:

• the uninstall dialog was failing to get the correct getGameInfo (the installedGames variable was not properly initialized) and then it was also skipping the set of the prefix for non-native games (so it was not showing the prefix to uninstall)
• when fixing the getGameInfo api function, this also fixed that issue when sometimes the GamePage component would show a game as NOT installed when the game is actually installed and displayed just fine in the library

@flavioislima I'm not sure why the if (!isNative || isDLC) check there included the native value so it would be great if you can review that, I don't know why that was there in the first place.

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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

[flavioislima]

@flavioislima I'm not sure why the if (!isNative || isDLC) check there included the native value so it would be great if you can review that, I don't know why that was there in the first place.

I also do not remember to be honest. I may have introduced there by mistake or was testing something when I was implementing the DLCs manager and forgot to revert.