Werk #16098: notification rules: match_folder value now matches correctly to available folders

This werk addresses an issue when creating or updating a notification rule via the REST-API. Previously, it would not correctly match the desired folder and as a result, you had to set this option to disabled which meant all rules were created in the main folder only.

Now the match_folder value field should match a folder id, in the form of the folder path, replacing / for ~

E.g.

/folder1 -> ~folder1 /folder1/folder2 -> ~folder1~folder2

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