Fix clippy warnings in rpc-probe

[thanethomson]

Minor tweak to remove/use private fields in the rpc-probe's PlanConfig struct.

[codecov-commenter]

Codecov Report

Merging #1076 (e2b7c40) into master (b52a5af) will increase coverage by 0.0%.
The diff coverage is n/a.

❗ Current head e2b7c40 differs from pull request most recent head 6f713f3. Consider uploading reports for the commit 6f713f3 to get more accurate results

@@          Coverage Diff           @@
##           master   #1076   +/-   ##
======================================
  Coverage    64.6%   64.6%           
======================================
  Files         238     238           
  Lines       20571   20571           
======================================
+ Hits        13301   13309    +8     
+ Misses       7270    7262    -8     

Impacted Files	Coverage Δ
tendermint/src/node.rs	63.5% <0.0%> (-0.2%)	⬇️
testgen/src/header.rs	79.3% <0.0%> (+0.6%)	⬆️
testgen/src/validator.rs	87.5% <0.0%> (+0.7%)	⬆️
light-client-verifier/src/types.rs	38.8% <0.0%> (+0.8%)	⬆️
testgen/src/vote.rs	85.7% <0.0%> (+1.6%)	⬆️
tendermint/src/block/commit_sig.rs	80.3% <0.0%> (+1.9%)	⬆️

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