Gauge RR flooring issue

[JTPetter]

• fixes an issue where flooring at 0 after calculating indices lead to wrong results (https://support.jasp-services.com/JASP-Services/internal_issues/issues/19)

[codecov-commenter]

Codecov Report

❌ Patch coverage is 86.66667% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.96%. Comparing base (1fa5cc5) to head (639a209).
⚠️ Report is 34 commits behind head on master.

Files with missing lines	Patch %	Lines
R/msaGaugeRR.R	50.00%	2 Missing ⚠️
R/processCapabilityStudies.R	91.66%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #471      +/-   ##
==========================================
+ Coverage   84.94%   84.96%   +0.01%     
==========================================
  Files          18       18              
  Lines        9975    10014      +39     
==========================================
+ Hits         8473     8508      +35     
- Misses       1502     1506       +4     

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