passfile not used as standard user for shared servers since 9.15

[lucaspinheiro1]

Probably related with #10136

Describe the bug

Since 9.15, standard users can not use the passfile defined in the connectionparameters of the shared server, it will ask for the password instead of connecting automatically. Admin can still use the passfile though.

To Reproduce

Steps to reproduce the behavior:

1. Define a servers.json in /pgadmin4/ with passfile as connectionparameter, and shared "true"
2. Start pgadmin
3. Connect as standard user, a password prompt will appear when selecting the connection
4. Connect as admin, no password prompt, connection is working

Expected behavior

The user should be able to use the passfile if shared by the admin as before 9.15.

Error message

no error found.

[youribonnaffe]

Had the same issue moving from 9.13 to 9.16. It is probably related to #9969 too.