[mediacapture-main] Pull Request: Ignore ideal values that don't belong on the device

alvestrand has just submitted a new pull request for 
https://github.com/w3c/mediacapture-main:

== Ignore ideal values that don't belong on the device ==
Ideal values (like height for an audio device) should be ignored
when calculating fitness distance. They still matter when exact.

Closes #409

See https://github.com/w3c/mediacapture-main/pull/432