The correct key is config.dns.revServer.active

[DL6ER]

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What does this PR aim to accomplish?:

Fix conditional forwarding status display

Note: This will again need to be changed once pi-hole/FTL#1797 lands to instead get the array of strings config.dns.revServers and count its length

How does this PR accomplish the above?:

Use the correct config key (it was renamed at some point)

Link documentation PRs if any are needed to support this PR:

-/-

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