tests/extmod/time_ms_us: Fix ticks tests, ticks_diff args are reversed.
tests/extmod/time_ms_us: Fix ticks tests, ticks_diff args are reversed.

bvernoux/micropython,swegener/micropython,tralamazza/micropython,MrSurly/micropython,adafruit/micropython,ryannathans/micropython,ryannathans/micropython,ryannathans/micropython,dmazzella/micropython,pozetroninc/micropython,adafruit/micropython,adafruit/micropython,swegener/micropython,pfalcon/micropython,pfalcon/micropython,pramasoul/micropython,henriknelson/micropython,pozetroninc/micropython,henriknelson/micropython,bvernoux/micropython,tralamazza/micropython,kerneltask/micropython,pozetroninc/micropython,trezor/micropython,swegener/micropython,adafruit/circuitpython,trezor/micropython,adafruit/micropython,pozetroninc/micropython,kerneltask/micropython,trezor/micropython,pramasoul/micropython,pfalcon/micropython,dmazzella/micropython,MrSurly/micropython,bvernoux/micropython,pramasoul/micropython,selste/micropython,kerneltask/micropython,tobbad/micropython,adafruit/circuitpython,ryannathans/micropython,tobbad/micropython,kerneltask/micropython,selste/micropython,bvernoux/micropython,henriknelson/micropython,pramasoul/micropython,MrSurly/micropython,adafruit/circuitpython,bvernoux/micropython,ryannathans/micropython,dmazzella/micropython,adafruit/circuitpython,pfalcon/micropython,adafruit/circuitpython,pramasoul/micropython,pozetroninc/micropython,MrSurly/micropython,adafruit/circuitpython,trezor/micropython,henriknelson/micropython,tobbad/micropython,tobbad/micropython,selste/micropython,dmazzella/micropython,swegener/micropython,swegener/micropython,selste/micropython,adafruit/micropython,kerneltask/micropython,MrSurly/micropython,tobbad/micropython,pfalcon/micropython,selste/micropython,tralamazza/micropython,tralamazza/micropython,trezor/micropython,henriknelson/micropython