Increased maximum copy-ratio variance slice-sampling bound.

[samuelklee]

Just a patch to make the change suggested in the review of broadinstitute/gatk-protected#1001. @asmirnov239 your comment was correct, not sure what I was thinking back then!

Closes #3372.

[samuelklee]

@asmirnov239 Not sure why I can't request a review from you through the menu on the top right, but please review.

[codecov-io]

Codecov Report

Merging #3378 into master will decrease coverage by 0.003%.
The diff coverage is 100%.

@@               Coverage Diff               @@
##              master     #3378       +/-   ##
===============================================
- Coverage     80.498%   80.495%   -0.003%     
  Complexity     17509     17509               
===============================================
  Files           1173      1173               
  Lines          63368     63368               
  Branches        9876      9876               
===============================================
- Hits           51010     51008        -2     
- Misses          8409      8411        +2     
  Partials        3949      3949

Impacted Files	Coverage Δ	Complexity Δ
...ender/tools/exome/copyratio/CopyRatioModeller.java	92.157% <100%> (ø)	7 <0> (ø)	⬇️
...e/hellbender/engine/spark/SparkContextFactory.java	66.667% <0%> (-3.333%)	10% <0%> (ø)

[asmirnov239]

@samuelklee Looks good! Feel free to merge!