[FS#917] Tunnels not vavalaiable in Realtime Graphs

[LEDE Bugs]

The following task has a new comment added:

FS#917 - Tunnels not vavalaiable in Realtime Graphs
User who did this - Jo-Philipp Wich (jow-)

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Fixed with https://github.com/openwrt/luci/commit/4201282559d85988990c8f48f4075bed5f785c2f
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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=917#comment4456