KeyControl: init keylock from config, fix pitchRatio rounding issue

[ronso0]

the two first bugfix commits from #4710, + debug output

Keylock ON not considered after start
https://bugs.launchpad.net/mixxx/+bug/1943180

Internal m_pitchRateInfo.keylock is updated only in KeyControl::updateRate() when any rate, keylock or vc controls are touched. Though, it may be requested by EngineBuffer prior to that, e.g when nudging a track, which results in a temporary keychange.
Also, with keylock enabled after start, the first call of KeyControl::updateRate() would interpret the update as keylock change which seems to affect m_pitchRateInfo members unintentionally.
Fix: update m_pitchRateInfo.keylock when initializing

Sudden false-positive pitch offset when unlocking key, see #4710 (comment)
probably regression from #1222
Fix: round pitchRatio if it's veeeery close to 1.0

[daschuer]

There is a clang format issue.

[daschuer]

I just did a brief test and it works good. Thank you.