extmod/modubinascii: Re-use error string to reduce code size.
extmod/modubinascii: Re-use error string to reduce code size.

Drops Thumb2 arch size by 24 bytes.

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opython,rubencabrera/micropython,xyb/micropython,ceramos/micropython,MrSurly/micropython,redbear/micropython,neilh10/micropython,Timmenem/micropython,noahwilliamsson/micropython,vriera/micropython