Fixed invalid type in StakingProductPosition

[codecov[bot]]

Codecov Report

Merging #413 (4470c5d) into master (8b5878a) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #413   +/-   ##
=======================================
  Coverage   70.02%   70.02%           
=======================================
  Files          74       74           
  Lines        6838     6838           
=======================================
  Hits         4788     4788           
  Misses       1550     1550           
  Partials      500      500           

Impacted Files	Coverage Δ
v2/client.go	80.81% <ø> (ø)
v2/delivery/client.go	83.10% <ø> (ø)
v2/depth_service.go	88.88% <ø> (ø)
v2/futures/client.go	75.98% <ø> (ø)
v2/futures/depth_service.go	89.47% <ø> (ø)
v2/futures/mark_price.go	83.33% <ø> (ø)
v2/futures/ticker_service.go	77.77% <ø> (ø)
v2/staking_service.go	36.14% <ø> (ø)
v2/ticker_service.go	75.23% <ø> (ø)

:mega: We’re building smart automated test selection to slash your CI/CD build times. Learn more