🐛🚸 BIQU BX Fixes & Improvements

[thisiskeithb]

Description

Fix BIQU BX Z Homing

A stock BIQU BX homes with a Z limit switch, not the probe. See the README for details on what users can do if they prefer to home with a probe:

https://github.com/MarlinFirmware/Configurations/blob/4bcabd685f851653883e456f3fdaf2bd0a058db6/config/examples/BIQU/BX/README.md?plain=1#L9-L11

While homing with a probe may be preferred, we should not be making this decision for users since they'd need to mod their stock machine.

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Sensorless homing fixes/improvements

• INDIVIDUAL_AXIS_HOMING_SUBMENU allows easier tuning of X & Y sensorless homing values via LCD.
• Sensorless homing with QUICK_HOME is not consistent

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Better Input Shaping defaults

• Users need to tune IS for their machine

Benefits

Fix config so it works for a stock machine & revert/improve recent changes