Lost the formatting method call in checked field getter

[bin1357]

Fix issues
#858

[codesandbox-ci]

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Latest deployment of this branch, based on commit 96e3e8a:

Sandbox	Source
final-form/react-final-form: simple	Configuration
final-form/react-final-form: record-level-validation	Configuration
final-form/react-final-form: field-level-validation	Configuration
final-form/react-final-form: submission-errors	Configuration
final-form/react-final-form: subscriptions	Configuration

[codecov]

Codecov Report

Merging #859 into master will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #859   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           17        17           
  Lines          253       255    +2     
  Branches        59        59           
=========================================
+ Hits           253       255    +2     

Impacted Files	Coverage Δ
src/useField.js	100.00% <100.00%> (ø)

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[erikras]

Published in v6.5.2.