py/objdict: Reuse dict-view key iterator for standard dict iterator.
py/objdict: Reuse dict-view key iterator for standard dict iterator.

It has equivalent behaviour and reusing it saves some code bytes.

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