Werk #1119: WATO create rule: No longer raises an incorrect permission warning when creating a new rule

A normal monitoring user which had only permissions to a given subfolder could not create a new rule when the rule formular was created with the main directory as rule path.

For example, if the user pressed "Create in folder: 'Main directory'" and switched the actual rule folder to his subfolder afterwards.
This resulted in a permission warning stating that the user has no permission to write into the 'Main directory'.

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