Fix true vacuum at high temperature

[vollous]

In some models, the BSMPT v2 global minimum does not find the global minimum, just non-global. We added a check to make sure that we always start from the true vacuum.

[codecov]

Codecov Report

Attention: Patch coverage is 78.57143% with 3 lines in your changes missing coverage. Please review.

Project coverage is 82.84%. Comparing base (8f5d454) to head (a0a4c78).

Files with missing lines	Patch %	Lines
src/minimum_tracer/minimum_tracer.cpp	78.57%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #161      +/-   ##
===========================================
+ Coverage    82.81%   82.84%   +0.02%     
===========================================
  Files           54       54              
  Lines        19384    19394      +10     
  Branches      1852     1855       +3     
===========================================
+ Hits         16053    16066      +13     
+ Misses        3331     3328       -3     

Flag	Coverage Δ
unittests	82.84% <78.57%> (+0.02%)	⬆️

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