Trim ToString() for units without abbreviation

[angularsen]

Scalar, Ratio and other quantities with units that don't have an abbreviation,
would result in a trailing whitespace.

Example: Scalar.FromAmount(1).ToString() == "1 "

[codecov]

Codecov Report

Merging #912 (e7259da) into master (2d23eac) will increase coverage by 0.1%.
The diff coverage is 100.0%.

❗ Current head e7259da differs from pull request most recent head 520613c. Consider uploading reports for the commit 520613c to get more accurate results

@@           Coverage Diff            @@
##           master    #912     +/-   ##
========================================
+ Coverage    82.8%   82.8%   +0.1%     
========================================
  Files         291     291             
  Lines       44040   44043      +3     
========================================
+ Hits        36423   36426      +3     
  Misses       7617    7617             

Impacted Files	Coverage Δ
UnitsNet/QuantityFormatter.cs	94.9% <100.0%> (+0.5%)	⬆️

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[lipchev]

It is quite unlikely but not impossible that someone out there is doing something like string.split(x)[1]

[angularsen]

It is quite unlikely but not impossible that someone out there is doing something like string.split(x)[1]

Right, but I still think the improvement outweighs the downside in that scenario.

[angularsen]

Release UnitsNet/4.88.0 · angularsen/UnitsNet