Made timestamp_us of sensor events increase monotonically for Nintendo controllers

[happyharryh]

Description

I am testing the sensor data of Nintendo controllers, finding that the new timestamp_us in SDL_ControllerSensorEvent increases un-monotonically, which brings some troubles.

This pull request makes the timestamp_us of Nintendo controllers change monotonically by modifying the order of SendSensorUpdate callings.

The timestamp_us changing:

Old:
    5000 -> 10000 -> 15000 -> 5000 -> 10000 -> 15000 ->
    20000 -> 25000 -> 30000 -> 20000 -> 25000 -> 30000 -> ...

New:
    5000 -> 5000 -> 10000 -> 10000 -> 15000 -> 15000 ->
    20000 -> 20000 -> 25000 -> 25000 -> 30000 -> 30000 -> ...