fix: mode=['month','month']时disabled-date不生效

[Eric592408]

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This is a ...

• [New feature]

What's the background?

1. Describe the source of requirement.
   使用mode为[‘month’,'month']时，disabled-date无法生效

API Realization (Optional if not new feature)

1. Basic thought of solution and other optional proposal.
   之前使用mode模式时，未接入disabled-date方法

What's the effect? (Optional if not new feature)

自测mode 为['month','month'],['year','year']时，符合预期，建议demo放在根目录app.vue

1. Does this PR affect user? Which part will be affected?
2. What will say in changelog?
3. Does this PR contains potential break change or other risk?

Changelog description (Optional if not new feature)

1. English description
2. Chinese description (optional)

Self Check before Merge

• Doc is updated/provided or not needed
• Demo is updated/provided or not needed
• TypeScript definition is updated/provided or not needed
• Changelog is provided or not needed

Additional Plan? (Optional if not new feature)

If this PR related with other PR or following info. You can type here.

[Eric592408]

find a function without import in code review

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