Fix MS MARCO V2.1 repo experiments on segmented doc collection

[lintool]

Proposed fix to #2480 (comment)

The issue is that '#' may get interpreted as a comment; WSL and Mac might also different on how interpolation, escaping, etc. is handled with ProcessBuilder. This works on my Mac.

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 66.43%. Comparing base (03b2ce9) to head (dc71934).
Report is 2 commits behind head on master.

Files	Patch %	Lines
src/main/java/io/anserini/reproduce/RunRepro.java	0.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2483      +/-   ##
============================================
+ Coverage     66.41%   66.43%   +0.01%     
- Complexity     1423     1424       +1     
============================================
  Files           215      215              
  Lines         12361    12367       +6     
  Branches       1503     1504       +1     
============================================
+ Hits           8210     8216       +6     
  Misses         3632     3632              
  Partials        519      519              

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[lintool]

This works on both Linux and Mac, so merging in. We can get someone to check Windows via WSL later.