Vehicle that has guns instatly shoots when player enters the vehicle

[DynamicMotz]

Describe the bug

When entering a vehicle that has guns that are mapped to the right-mouse-button they will instantly shoot because right-mouse-button is also the key to enter the vehicle.

To Reproduce
Steps to reproduce the behaviour:

1. Spawn a vehicle that has a secundary gun
2. Load the vehicle guns
3. Enter the vehicle

Expected behaviour

Guns should not fire until the right-mouse-button is depressed and pressed again.

Versions (please complete the following information)

• Forge: 14.23.5.2768
• Flan's Mod: 1.12.2 branch (at 425eee3)