Stop pfblocker rules being added twice

If users move rules around in the GUI, the the rules for 1 interface can end up in separate blocks in config.xml. This causes pfBlocker code to put a set of pfBlocker rules before each separate block of rules for an interface, as they are processed out of config.xml.
The code here fixes that, ensuring that pfBlocker rules are only added once to an interface, the first time the interface is found in a rule.

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