Describe the bug
Controller controls aren't saved when exiting the settings menu.

To Reproduce
Steps to reproduce the behavior:

1. Go to LambdaControls Settings > Controller Controls
2. Rebind any button (for example, bind Jump to LT)
3. Exit the settings menu
4. Restart Minecraft, repeat step 1
5. Observe the binding being the same as before you started

Expected behavior
Rebinding a control persists between sessions.

Desktop (please complete the following information):

• OS: Linux [Ubuntu 20.04]
• Minecraft: 1.16.5
• Fabric: 0.32.5+1.16
• Mods: Attached as mods.txt due to longevity (don't know which ones are actually relevant)
• Version: 1.6.0
• Branch: 1.16

Additional context
If the configuration file is edited manually, the mod will observe the rebinds, as expected.

Fixed in e652390.