Keeps the width sensor state in sync with the associated runout sensor and
normalizes the output when the width sensor is disabled.
When the width sensor was disabled the associated filament sensor remained
enabled but was no longer updated so would be 'stuck' in the last state it
was in before the width sensor was disabled.
The toggle switch and readings in the web interface could also be out of sync
with the actual sensor and filament states, misleading the user.
Now, when the width sensor is disabled:
- The filament sensor is disabled
- The reported filament state is 'present'
- The reported filament diameter is the nominal diameter
When the width sensor is enabled:
- The filament sensor is enabled
- The reported filament state is the derived state
- The reported filament diameter is the measured value
Finally, `min_diameter` is now used to determine the runout state rather than
a fixed value of `0.5`.
Signed-off-by: Ben Lye ben@lye.co.nz
3a0b834f3a