chore(bft/rpc): fix typo in handlers.go

[eltociear]

Covert -> Convert

Contributors' checklist...

• Added new tests, or not needed, or not feasible
• Provided an example (e.g. screenshot) to aid review or the PR is self-explanatory
• Updated the official documentation or not needed
• No breaking changes were made, or a BREAKING CHANGE: xxx message was included in the description
• Added references to related issues and PRs
• Provided any useful hints for running manual tests
• Added new benchmarks to generated graphs, if any. More info here.

[thehowl]

Thanks!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9734695) 56.25% compared to head (e2a51cf) 56.12%.
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1648      +/-   ##
==========================================
- Coverage   56.25%   56.12%   -0.14%     
==========================================
  Files         425      439      +14     
  Lines       64408    66185    +1777     
==========================================
+ Hits        36235    37147     +912     
- Misses      25351    26146     +795     
- Partials     2822     2892      +70     

Flag	Coverage Δ
go-1.21.x	∅ <ø> (∅)
misc	∅ <ø> (∅)
misc-_test.genstd	∅ <ø> (∅)

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