[ISSUE #12519] Fix the file being watched which should be the same with the file being reloaded shen staring up nacos server

[lingyufei]

Please refer to #12519 for more details.

What is the purpose of the change

When staging up the nacos server, registerWatcher would be invoked. However, the file being watched is /home/user/nacos/conf/application.properties, and the file and properties being reloaded in the onChange method is classpath/application.properties or ${spring.config.additional-location}/application.properties. It's inconsistent

I change the file being watched to lasspath/application.properties or ${spring.config.additional-location}/application.properties rather than /home/user/nacos/conf/application.properties

Brief changelog

Fix the file being watched which should be the same with the file being reloaded shen staring up nacos server

Verifying this change

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