Properly fix security issue with v2.2.16

Hello there,

in the update announcement, there are the following pieces of information:

All affected customers should either upgrade to XenForo 2.1.15 or XenForo 2.2.16.
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We recommend doing a full upgrade to resolve the issue, but a patch can be applied manually to any version. See below for further details.
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but also:

Note: This file cannot be patched automatically as it contains install-specific data. You must apply this change manually to any XenForo...
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