Set default thermo_type in thermo search method

[munrojm]

Ensure ThermoType.GGA_GGA_U is the default return type for all thermo data accessed through MPRester.thermo.search.

[codecov-commenter]

Codecov Report

Base: 81.18% // Head: 81.05% // Decreases project coverage by -0.12% ⚠️

Coverage data is based on head (9b74ed4) compared to base (bebe77b).
Patch coverage: 50.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #726      +/-   ##
==========================================
- Coverage   81.18%   81.05%   -0.13%     
==========================================
  Files          36       36              
  Lines        1759     1758       -1     
==========================================
- Hits         1428     1425       -3     
- Misses        331      333       +2     

Impacted Files	Coverage Δ
mp_api/client/mprester.py	58.80% <0.00%> (-0.93%)	⬇️
mp_api/client/routes/thermo.py	97.87% <100.00%> (+2.12%)	⬆️

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