fix(codegen): checkstyle errors in AddBuiltinPlugins.java

[trivikr]

Issue #, if available:
The codegen-ci is failing in master https://github.com/aws/aws-sdk-js-v3/runs/1476861228#step:5:31
These errors were mistakenly introduced in PR #1706

Description of changes:
fix checkstyle errors in AddBuiltinPlugins.java

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[codecov-io]

Codecov Report

Merging #1731 (e61363c) into master (de75f7e) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1731      +/-   ##
==========================================
- Coverage   79.77%   79.76%   -0.02%     
==========================================
  Files         325      329       +4     
  Lines       12087    12584     +497     
  Branches     2553     2673     +120     
==========================================
+ Hits         9643    10038     +395     
- Misses       2444     2546     +102     

Impacted Files	Coverage Δ
...tocol_tests/aws-restxml/commands/XmlMapsCommand.ts	95.65% <0.00%> (-4.35%)	⬇️
...ocol_tests/aws-restxml/commands/XmlBlobsCommand.ts	95.65% <0.00%> (-4.35%)	⬇️
...ocol_tests/aws-restxml/commands/XmlEnumsCommand.ts	95.65% <0.00%> (-4.35%)	⬇️
...ocol_tests/aws-restxml/commands/XmlListsCommand.ts	95.65% <0.00%> (-4.35%)	⬇️
...col_tests/aws-restjson/commands/JsonMapsCommand.ts	95.65% <0.00%> (-4.35%)	⬇️
...ol_tests/aws-restjson/commands/JsonBlobsCommand.ts	95.65% <0.00%> (-4.35%)	⬇️
...ol_tests/aws-restjson/commands/JsonEnumsCommand.ts	95.65% <0.00%> (-4.35%)	⬇️
...ol_tests/aws-restjson/commands/JsonListsCommand.ts	95.65% <0.00%> (-4.35%)	⬇️
...tests/aws-restxml/commands/XmlAttributesCommand.ts	95.65% <0.00%> (-4.35%)	⬇️
...tests/aws-restxml/commands/XmlNamespacesCommand.ts	95.65% <0.00%> (-4.35%)	⬇️
... and 124 more

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