Fixed issues
Fixed some codacy issues and requested changes. https://app.codacy.com/gh/dbeaver/dbeaver/pullRequest?prid=7867479 https://github.com/dbeaver/dbeaver/pull/13449#pullrequestreview-723256362
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![plugins/org.jkiss.dbeaver.ext.oceanbase/icons/ob_icon.png](https://gitcode.net/suliangchun/dbeaver/-/raw/7cce8e5e95ec7eba561fbfff833002796e78ea8d/plugins/org.jkiss.dbeaver.ext.oceanbase/icons/ob_icon.png)
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