Playstation controller sendables have duplicate keys

[ThadHouse]

Describe the bug
The PS controllers generate multiple objects in the sendable with the same key.

 builder.AddDoubleProperty("L2", [this] { return GetL2Axis(); }, nullptr);
 builder.AddDoubleProperty("R2", [this] { return GetR2Axis(); }, nullptr);
 builder.AddBooleanProperty("L2", [this] { return GetL2Button(); }, nullptr);
 builder.AddBooleanProperty("R2", [this] { return GetR2Button(); }, nullptr);

This results in lots of NT type changes, and also in epilogue a bunch of logspam.

[EPILOGUE] An error occurred while logging an instance of frc.robot.RobotContainer: class edu.wpi.first.networktables.DoubleEntryImpl cannot be cast to class edu.wpi.first.networktables.BooleanPublisher (edu.wpi.first.networktables.DoubleEntryImpl and edu.wpi.first.networktables.BooleanPublisher are in unnamed module of loader 'app')