fix: add automaticallyDeleteInterval.description English localization

[sbolel]

Summary of Changes

This PR adds the English localization for the configuration.automaticallyDeleteInterval.description. Currently, this localization value is present in the Japanese definitions, but is missing in the English definitions. This causes the user to see the raw template string in the settings for Line Note instead of a descriptive sentence.

Changes Made

• Added configuration.automaticallyDeleteInterval.description to package.nls.json. This description explains that this setting defines the time interval (in milliseconds) for checking and automatically deleting notes, providing a better understanding for users.

Related Issues

• Fixes tkrkt/linenote#37