fix: set auto commit back to true after add/remove

[JCereal]

Fix: #51

[casbin-bot]

@tangyang9464 @seriouszyx @elfisworking please review

[CLAassistant]

All committers have signed the CLA.

[tangyang9464]

lgtm

[codecov]

Codecov Report

Merging #50 (a67412b) into master (8cae426) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #50   +/-   ##
=======================================
  Coverage   72.09%   72.09%           
=======================================
  Files           3        3           
  Lines          86       86           
  Branches       26       26           
=======================================
  Hits           62       62           
  Misses         13       13           
  Partials       11       11           

Impacted Files	Coverage Δ
.../main/java/org/casbin/adapter/JDBCBaseAdapter.java	100.00% <ø> (ø)

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[github-actions]

🎉 This PR is included in version 2.2.2 🎉

The release is available on:

• GitHub release
• v2.2.2

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