Benchmark script fixes

[zphang]

No description provided.

[codecov]

Codecov Report

Merging #1301 (7302452) into master (4ab0c08) will increase coverage by 0.00%.
The diff coverage is 50.00%.

@@           Coverage Diff           @@
##           master    #1301   +/-   ##
=======================================
  Coverage   48.46%   48.47%           
=======================================
  Files         163      163           
  Lines       11214    11216    +2     
=======================================
+ Hits         5435     5437    +2     
  Misses       5779     5779           

Impacted Files	Coverage Δ
...ripts/benchmarks/benchmark_submission_formatter.py	0.00% <0.00%> (ø)
jiant/tasks/lib/templates/edge_probing_two_span.py	98.71% <100.00%> (+0.03%)	⬆️

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