Remove non-existent Maslow_Calibration_Current_Threshold setting from web UI

[Copilot]

Web UI referenced Maslow_Calibration_Current_Threshold setting that was never registered in firmware, causing "Invalid setting or command" errors on startup and when attempting to configure calibration parameters.

Changes

• Removed invalid setting reference from ESP3D-WEBUI/www/js/settings.js

  • Deleted Maslow_Calibration_Current_Threshold tooltip entry (line 35)

• Updated tooltip for Maslow_Retract_Current_Threshold to clarify usage

  • Changed from "retract before considering them to be all the way in"
  • To "retraction and calibration before considering them to be tight"

• Rebuilt web UI and updated firmware/FluidNC/data/index.html.gz

Context

Firmware uses single retractCurrentThreshold value for both operations:

• Registration: MachineConfig.cpp:103 as Maslow_Retract_Current_Threshold
• Retraction: MotorUnit.cpp:202
• Calibration: Calibration.cpp:949,951

No separate calibration threshold exists or ever existed in the firmware.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Code inconsistency? Maslow_Calibration_Current_Threshold</issue_title>
<issue_description>Firmware 1.16 (I think)
As my Maslow 4.1 starts up, I get the following message:

[MSG:ERR: Invalid setting or command: /Maslow_Calibration_Current_Threshold]
error:3

Doesn't impede anything. There's a an entry for Calibration Force in the Setup/Configure panel, initially empty. When I try to put a value there and save it, I get

[MSG:ERR: Invalid setting or command: /Maslow_Calibration_Current_Threshold with value: 1000]

As far as I can tell, none of this makes a difference to the machine, which just uses the value for retraction (?) but it is a puzzlement. Is there something else going on there?
</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Code inconsistency? Maslow_Calibration_Current_Threshold #677

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