Update default precision for instantaneous demand + current

[TheJulianJES]

This updates the suggested display precision for the instantaneous demand entity and the RMS current entity.

The instantaneous demand entity then aligns with the EM active power entities (suggested precision 1).
The RMS current entity uses suggested precision 2 to not cut off low-power draw devices, often attached to smart plugs.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.02%. Comparing base (37d2efb) to head (d1d7ca8).

Additional details and impacted files

@@           Coverage Diff           @@
##              dev     #624   +/-   ##
=======================================
  Coverage   97.01%   97.02%           
=======================================
  Files          63       63           
  Lines       10569    10571    +2     
=======================================
+ Hits        10254    10256    +2     
  Misses        315      315           

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