Fix weights precision in CLI tool default micro output file

[martinholmer]

When using neither the tc tmd.csv ... --dump option nor the tc tmd.csv ... --sqldb option, the weights in the micro output file were being incorrectly rounded to two (rather than five) decimal digits. This PR fixes that problem. There is no change in tc tmd.csv ... micro output when using either the --dump option or the --sqldb option (that is, the weights precision remains five digits after the decimal point).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.42%. Comparing base (b3bca61) to head (8542516).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2841   +/-   ##
=======================================
  Coverage   99.42%   99.42%           
=======================================
  Files          13       13           
  Lines        2617     2619    +2     
=======================================
+ Hits         2602     2604    +2     
  Misses         15       15           

Flag	Coverage Δ
unittests	99.42% <100.00%> (+<0.01%)	⬆️

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Files with missing lines	Coverage Δ
taxcalc/taxcalcio.py	100.00% <100.00%> (ø)

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