Fix getTypeDef for basic types (SYN-5327)

[Cisphyx]

No description provided.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.10 ⚠️

Comparison is base (b3557bf) 97.30% compared to head (d2464e4) 97.20%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3139      +/-   ##
==========================================
- Coverage   97.30%   97.20%   -0.10%     
==========================================
  Files         222      222              
  Lines       44327    44327              
==========================================
- Hits        43133    43089      -44     
- Misses       1194     1238      +44     

Flag	Coverage Δ
linux	97.20% <100.00%> (ø)
linux_replay	?

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Impacted Files	Coverage Δ
synapse/lib/types.py	97.62% <100.00%> (ø)

... and 9 files with indirect coverage changes

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