fix: fix total voters count

[ulbqb]

Description

The function Voters is used to fetch and verify voters. However, the function Voters assigns the length of l.ValidatorSet.Validators instead of l.VoterSet.Voters to totalCount, which may cause incorrect return value in the remaining statements.

[codecov]

Codecov Report

Merging #520 (3a6d0a7) into main (160e52f) will increase coverage by 0.06%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #520      +/-   ##
==========================================
+ Coverage   65.81%   65.88%   +0.06%     
==========================================
  Files         279      279              
  Lines       38057    38057              
==========================================
+ Hits        25047    25072      +25     
+ Misses      11209    11183      -26     
- Partials     1801     1802       +1     

Impacted Files	Coverage Δ
types/voter_set.go	85.80% <0.00%> (-0.84%)	⬇️
p2p/pex/pex_reactor.go	79.05% <0.00%> (-0.62%)	⬇️
consensus/reactor.go	74.58% <0.00%> (-0.36%)	⬇️
blockchain/v0/reactor.go	69.79% <0.00%> (-0.34%)	⬇️
consensus/state.go	73.06% <0.00%> (-0.18%)	⬇️
p2p/conn/connection.go	80.38% <0.00%> (ø)
proxy/multi_app_conn.go	47.66% <0.00%> (ø)
abci/client/socket_client.go	72.96% <0.00%> (+0.87%)	⬆️
statesync/snapshots.go	94.96% <0.00%> (+1.25%)	⬆️
light/client.go	63.52% <0.00%> (+2.35%)	⬆️
... and 2 more