[General] Allow triggering a game update manually even if no update option is shown

[arielj]

The icon indicating that a game can be updated seems to not always work as expected, users may see a message on the game saying the game is outdated but Heroic, sometimes, doesn't give them the option to update the game.

This PR adds a new button in the Tools screen of a game to force Legendary's update command on a given game.

The icon is disabled while the update command gets executed to prevent multiple command calls.

---

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]

Nice, good stuff!