[ENHANCEMENT] Allow operator discretion for clearing MMU3 errors.

[ssackett]

Printer model

• MK3S/+
• MK3
• MK2.5S
• MK2.5

Describe the enhancement

Sometimes the MMU3 enters an error condition because the sensors have not sequenced properly. Often the operator can tell there is nothing wrong but there is no way to clear the error except for repeating the process to sequence the sensors properly. Such a condition happens if a filament runs out and the operator manually loads a new filament but pushes it in far enough to trip the sensor in the MMU3 head. In this case the MMU3 will recalibrate and cut the filament rather than loading it to the extruder.

Expected functionality

Allow the operator to tell the MMU3 that the filament is properly loaded so that it doesn't end up going into an error condition when the sensors don't trip in the expected sequence.

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[github-actions]

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