site depth bug

[tedsharpe]

This was code left over from when we put the sample name in a header line rather than as a column. It needs to go.

[mwalker174]

Ok looks good!

[codecov]

Codecov Report

Merging #7910 (d2b0497) into master (6170e83) will increase coverage by 0.003%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##              master     #7910       +/-   ##
===============================================
+ Coverage     86.988%   86.992%   +0.003%     
+ Complexity     36968     36963        -5     
===============================================
  Files           2221      2221               
  Lines         173900    173894        -6     
  Branches       18784     18785        +1     
===============================================
  Hits          151273    151273               
+ Misses         15987     15984        -3     
+ Partials        6640      6637        -3     

Impacted Files	Coverage Δ
...ute/hellbender/utils/codecs/SiteDepthBCICodec.java	12.000% <ø> (+1.286%)	⬆️
...titute/hellbender/utils/codecs/SiteDepthCodec.java	82.143% <ø> (+7.949%)	⬆️
...itute/hellbender/tools/LocalAssemblerUnitTest.java	92.448% <0.000%> (ø)