github: point to forum feature request category

This should have been amended in the previous commit.

Fixes: 65e72f8e380e ("github: add issue template")
Signed-off-by: Stijn Tintel <[email protected]>

.github/ISSUE_TEMPLATE/config.yml

@@ -2,7 +2,7 @@
 blank_issues_enabled: false
 contact_links:
   - name: Feature request
-    url: https://forum.openwrt.org
+    url: https://forum.openwrt.org/c/feature-requests
     about: The OpenWrt project relies on volunteers. While we appreciate feature requests, we might lack the manpower to handle them. Ideally, you get familiar with the codebase and attempt to contribute the feature yourself. We recommend to post in the forum, as this is the most likely place to receive feedback on feature requests.
   - name: OpenWrt community
     url: https://openwrt.org/contact