use _getIndxChop on hex types to make large rsa:key modulus values work

[Cisphyx]

No description provided.

[codecov]

Codecov Report

Merging #1398 into master will decrease coverage by 0.05%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1398      +/-   ##
==========================================
- Coverage   95.12%   95.06%   -0.06%     
==========================================
  Files         133      133              
  Lines       19427    19427              
==========================================
- Hits        18479    18469      -10     
- Misses        948      958      +10

Flag	Coverage Δ
#linux	95.06% <100%> (-0.02%)	⬇️
#osx	?

Impacted Files	Coverage Δ
synapse/lib/types.py	99.13% <100%> (ø)	⬆️
synapse/lib/platforms/darwin.py	0% <0%> (-100%)	⬇️
synapse/lib/thisplat.py	58.33% <0%> (-8.34%)	⬇️
synapse/lib/base.py	89.43% <0%> (-1%)	⬇️
synapse/lib/link.py	98.54% <0%> (-0.73%)	⬇️
synapse/lib/lmdbslab.py	98.93% <0%> (-0.16%)	⬇️

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