Speedup sreen update delay
and correct a comment.

A module division by 10 is slooooow. (powers of 2 are fast - but then you can AND a bitmask with the same result)

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Minor DELTA segmentation speedup by pulling calculations out of the loop.

Make sure to only set the fan state once when extruders share a fan

Update forgotten Configuration_DUAL.h

Addressing #3743

Idle during long arcs
to prevent from watchdog resets during high segmented fast arcs.

Saves about 2669 bytes when deactivated. (About 1% for a AT2560, about __4%__ for a AT644!)

Add a forgotten condition

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It update forgotten Configuration_DUAL.h.

Reference: https://github.com/MarlinFirmware/Marlin/pull/3713#issuecomment-218333678

Addressing #3711