policy: update max nulldata size

[tuxcanfly]

Refs #50

[codecov-io]

Codecov Report

Merging #71 into master will decrease coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #71      +/-   ##
==========================================
- Coverage   54.76%   54.74%   -0.02%     
==========================================
  Files         109      111       +2     
  Lines       27057    27058       +1     
  Branches     4479     4480       +1     
==========================================
- Hits        14817    14814       -3     
- Misses      12240    12244       +4

Impacted Files	Coverage Δ
lib/protocol/policy.js	88.23% <100%> (ø)	⬆️
lib/indexer/indexer.js	73.88% <0%> (-2.3%)	⬇️
lib/indexer/nullclient.js	8.82% <0%> (-1.18%)	⬇️
lib/indexer/chainclient.js	85.48% <0%> (-0.46%)	⬇️
lib/indexer/records.js	50.84% <0%> (ø)	⬆️
lib/indexer/layout.js	100% <0%> (ø)	⬆️
lib/indexer/addrindexer.js
lib/indexer/txindexer.js
lib/indexer/txindexer/txindexer.js	82.85% <0%> (ø)
lib/indexer/addrindexer/addrindexer.js	97.46% <0%> (ø)
... and 4 more

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