Minor viomi cleanups

[rytilahti]

• Move misplaced viomivacuum into viomi/vacuum
• Disable unknown sensors
• Unmark error to be a standard id, as it's not really used by homeassistant

[codecov-commenter]

Codecov Report

Merging #1742 (b354ab9) into master (7bd3e34) will decrease coverage by 0.01%.
The diff coverage is 85.71%.

📣 This organization is not using Codecov’s GitHub App Integration. We recommend you install it so Codecov can continue to function properly for your repositories. Learn more

@@            Coverage Diff             @@
##           master    #1742      +/-   ##
==========================================
- Coverage   81.91%   81.91%   -0.01%     
==========================================
  Files         196      196              
  Lines       18084    18081       -3     
  Branches     3862     3856       -6     
==========================================
- Hits        14814    14811       -3     
  Misses       2980     2980              
  Partials      290      290              

Impacted Files	Coverage Δ
miio/integrations/viomi/vacuum/__init__.py	100.00% <ø> (ø)
miio/integrations/viomi/vacuum/viomivacuum.py	59.27% <83.33%> (ø)
miio/__init__.py	100.00% <100.00%> (ø)

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more