Remove MAX_PLUS fan speed level for OZMO 920

[mrbungle64]

• The Deebot OZMO 920 has only three suction levels.
• The class 'yna5xi' refers to the Deebot OZMO 920 (only).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.99%. Comparing base (f87b6c9) to head (fbec46e).

Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #1599   +/-   ##
=======================================
  Coverage   94.99%   94.99%           
=======================================
  Files         158      158           
  Lines        6199     6199           
  Branches      353      353           
=======================================
  Hits         5889     5889           
  Misses        248      248           
  Partials       62       62           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[codspeed]

Merging this PR will not alter performance

✅ 113 untouched benchmarks

---

_{Comparing mrbungle64:dev (fbec46e) with dev (f87b6c9)}

[edenhaus]

yna5xi is the class id for the 950. See https://github.com/MVladislav/bumper/blob/main/bumper/web/static_api/productIotMap.json#L4856C3-L4873C5

Are you sure that the device class is a 920?
If I remember it correctly it was the class of my old broken one, which was a 950