Remove erronous check on RSA-PSS certificates

[randombit]

Fixes #3019

[codecov-commenter]

Codecov Report

Patch coverage: 77.77% and project coverage change: -0.04 ⚠️

Comparison is base (d8db5f2) 88.17% compared to head (cc621da) 88.14%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3421      +/-   ##
==========================================
- Coverage   88.17%   88.14%   -0.04%     
==========================================
  Files         619      619              
  Lines       70296    70295       -1     
  Branches     6995     6992       -3     
==========================================
- Hits        61986    61962      -24     
- Misses       5386     5420      +34     
+ Partials     2924     2913      -11     

Impacted Files	Coverage Δ
src/lib/x509/x509cert.cpp	73.50% <ø> (+0.02%)	⬆️
src/tests/unit_x509.cpp	93.84% <77.77%> (-0.19%)	⬇️

... and 15 files with indirect coverage changes

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