1876 Fix number of processors for perf tests

[nlslatt]

I corrected a use of the wrong variable and also made 2 the minimum number of ranks to use for perf tests. ping_pong had been trying to run on only 1 rank, which was breaking Gitlab CI.

Fixes #1876

[github-actions]

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[prwolfe]

Makes sense to me.

[codecov]

Codecov Report

Merging #1877 (bda9a9d) into develop (41a66fb) will decrease coverage by 0.05%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #1877      +/-   ##
===========================================
- Coverage    84.43%   84.37%   -0.06%     
===========================================
  Files          760      760              
  Lines        26790    26791       +1     
===========================================
- Hits         22621    22606      -15     
- Misses        4169     4185      +16     

Impacted Files	Coverage Δ
src/vt/topos/location/location.impl.h	88.19% <0.00%> (-5.91%)	⬇️
tutorial/tutorial_1h.h	100.00% <0.00%> (ø)