[example] Mecanum controller command example has incorrect wheel order

[KangarooKoala]

Describe the bug
In the drive subsystem of the mecanum controller command example, the order that the wheels are passed to the MecanumDriveWheelSpeeds and MecanumDriveWheelPositions constructors is wrong. It uses frontLeft, rearLeft, frontRight, rearRight, when the actual constructors use frontLeft, frontRight, rearLeft, rearRight.

Links to code

• Java: https://github.com/wpilibsuite/allwpilib/blob/main/wpilibjExamples/src/main/java/edu/wpi/first/wpilibj/examples/mecanumcontrollercommand/subsystems/DriveSubsystem.java
• C++: https://github.com/wpilibsuite/allwpilib/blob/main/wpilibcExamples/src/main/cpp/examples/MecanumControllerCommand/cpp/subsystems/DriveSubsystem.cpp

Expected behavior
The order in the example should be correct. (That is, the example should use frontLeft, frontRight, rearLeft, and rearRight)

Additional context
This would be a relatively low effort issue- Just swapping the order of two arguments in 4 places and double checking the other examples for any other bugs.