tests: wait longer in TestTotalWeightChanges for larger nightly test network

[ohill]

Summary

During nightly / non-short runs, TestTotalWeightChanges uses a 7-node test network (compared to 3 nodes for PR commit short tests) and sometimes hits this 30s timeout when running in CI, this happens while nodes are first starting up and not yet finished coming to agreement on round 1. Provides a little more time for nodes to start up in a resource constrained nightly CI runner machine

Test Plan

Tests are unchanged except for length of timeout.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (90b10d2) 55.81% compared to head (06ed556) 55.77%.
Report is 12 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5841      +/-   ##
==========================================
- Coverage   55.81%   55.77%   -0.05%     
==========================================
  Files         476      476              
  Lines       67138    67138              
==========================================
- Hits        37476    37448      -28     
- Misses      27141    27154      +13     
- Partials     2521     2536      +15     

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