Update StarRocksSinkOptions.java

[uicosp]

auto add __op for primary key table even when user specified sink.properties.columns

What type of PR is this：

• [x] BugFix
• [ ] Feature
• [x] Enhancement
• [ ] Refactor
• [ ] UT
• [ ] Doc
• [ ] Tool

Which issues of this PR fixes ：

Problem Summary(Required) ：

auto add __op for primary key table even when user specified sink.properties.columns, in case user use a bitmap datatype and need set up sink.properties.columns, may forget to add __op.

Checklist:

• [ ] I have added test cases for my bug fix or my new feature
• [ ] This pr will affect users' behaviors
• [ ] This pr needs user documentation (for new or modified features or behaviors)
• [ ] I have added documentation for my new feature or new function

[CLAassistant]

All committers have signed the CLA.