Use a better naming for the variable

[rleungx]

This PR uses value to replace severity in convertToScore since both severity and confidence will use this function.

[rleungx]

@ccojocar PTAL, thanks.

[codecov-commenter]

Codecov Report

Merging #715 (99495e9) into master (6921395) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           master     #715   +/-   ##
=======================================
  Coverage   69.60%   69.60%           
=======================================
  Files          47       47           
  Lines        2859     2859           
=======================================
  Hits         1990     1990           
  Misses        813      813           
  Partials       56       56           

Impacted Files	Coverage Δ
cmd/gosec/main.go	0.00% <0.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 6921395...99495e9. Read the comment docs.