Fix SV QNameFinder to handle reads with negative unclipped starts

[cwhelan]

Attempts to fix #5685

I don't have test data from the users who reported the bug but it seemed like it was likely due to this issue.

[codecov-io]

Codecov Report

Merging #5864 into master will decrease coverage by 0.005%.
The diff coverage is 100%.

@@               Coverage Diff               @@
##              master     #5864       +/-   ##
===============================================
- Coverage     87.068%   87.063%   -0.005%     
+ Complexity     32234     32232        -2     
===============================================
  Files           1985      1985               
  Lines         147653    147675       +22     
  Branches       16235     16235               
===============================================
+ Hits          128559    128571       +12     
- Misses         13167     13175        +8     
- Partials        5927      5929        +2

Impacted Files	Coverage Δ	Complexity Δ
...ender/tools/spark/sv/evidence/QNameFinderTest.java	96.078% <100%> (+2.745%)	4 <1> (+1)	⬆️
...ellbender/tools/spark/sv/evidence/QNameFinder.java	96% <100%> (+0.167%)	10 <0> (ø)	⬇️
...utils/smithwaterman/SmithWatermanIntelAligner.java	50% <0%> (-40%)	1% <0%> (-2%)
...ithwaterman/SmithWatermanIntelAlignerUnitTest.java	60% <0%> (-30%)	2% <0%> (ø)
...nder/utils/runtime/StreamingProcessController.java	67.773% <0%> (-0.948%)	33% <0%> (-1%)
...lotypecaller/readthreading/ReadThreadingGraph.java	88.725% <0%> (-0.245%)	159% <0%> (ø)

[tedsharpe]

This looks fine to me.

[tedsharpe]

@cwhelan I merged it for you. Hope you don't mind.