refactor: optimized logic for closing tabs

[likui628]

General

优化了关闭左侧，右侧，其它标签的逻辑

1. 修复 #215 遗留问题
2. 关闭其它标签是判断当前路由是否还存在，如果不存在则跳转到目标页面或者首页

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• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
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• [ ] This change requires a documentation update

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