Set logseq-koreader-sync effect to `true`.

[isosphere]

Setting effect to true is required for showDirectoryPicker; this plugin reads document annotations from koreader on the filesystem. As discussed on discord.

Update an Existing Plugin

Plugin Github repo URL: https://github.com/isosphere/logseq-koreader-sync

Github releases checklist

• [x] a legal package.json file.
• [x] a valid CI workflow build action for Github releases. (theme plugin for this).
• [x] a release which includes a release zip pkg from a successful build.
• [x] a clear README file, ideally with an image or gif showcase. (For more friendly to users, it is recommended to have English version description).
• [x] a license in the LICENSE file.