Menu arrow style fix

[break60]

Tips

• Thanks very much for contributing to Apache DolphinScheduler.
• Please review https://dolphinscheduler.apache.org/en-us/community/index.html before opening a pull request.

What is the purpose of the pull request

(For example: This pull request adds checkstyle plugin.)

Brief change log

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• Add maven-checkstyle-plugin to root pom.xml

Verify this pull request

(Please pick either of the following options)

This pull request is code cleanup without any test coverage.

(or)

This pull request is already covered by existing tests, such as (please describe tests).

(or)

This change added tests and can be verified as follows:

(example:)

• Added dolphinscheduler-dao tests for end-to-end.
• Added CronUtilsTest to verify the change.
• Manually verified the change by testing locally.

[codecov-io]

Codecov Report

Merging #1531 into dev will decrease coverage by 0.01%.
The diff coverage is n/a.

@@           Coverage Diff            @@
##             dev   #1531      +/-   ##
========================================
- Coverage   6.98%   6.97%   -0.02%     
========================================
  Files        272     272              
  Lines      13622   13622              
  Branches    2168    2168              
========================================
- Hits         952     950       -2     
- Misses     12603   12605       +2     
  Partials      67      67

Impacted Files	Coverage Δ
...ache/dolphinscheduler/common/enums/ZKNodeType.java	0% <0%> (-100%)	⬇️

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[qiaozhanwei]

+1