Fix proper permissions for multiple file access

Fixes #8890

In case you have access to a file via multiple ways, for example:
1. the file is shared with you with permission read only
2. the folder containing the file is shared with your read/write

Requesting the getById function on the userFolder would give back two
entries but both with the same permissions. Depending on the node you
picked this is not right.

Signed-off-by: Roeland Jago Douma <roeland@famdouma.nl>