Set axis scale to log for p, v in IdealGas

[bryanwweber]

• [ ] Tests added
• [ ] Added entry into CHANGELOG.md

Changes proposed in this pull request:

• This was inadvertently only added to the VaporDome class, but we want to set log scaling for p and v on both types of graph.

[codecov[bot]]

Codecov Report

Merging #32 (2a5a791) into main (b3fde73) will increase coverage by 0.05%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #32      +/-   ##
==========================================
+ Coverage   97.02%   97.08%   +0.05%     
==========================================
  Files           4        4              
  Lines         404      412       +8     
  Branches       95      105      +10     
==========================================
+ Hits          392      400       +8     
  Misses          5        5              
  Partials        7        7              

Impacted Files	Coverage Δ
src/thermostate/__init__.py	100.00% <100.00%> (ø)
src/thermostate/plotting.py	95.09% <100.00%> (+0.09%)	:arrow_up:

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