zabbix: add php8 filter dependency for frontend

For zabbix-server-frontend, the absence of php8-mod-filter results in
many of the frontend's pages failing to render.  Therefore add this
module as a frontend dependency.

Signed-off-by: Daniel F. Dickinson <[email protected]>

Author: danielfdickinson

admin/zabbix/Makefile

@@ -194,6 +194,7 @@ define Package/zabbix-server-frontend
     +php8-mod-gd \
     +php8-mod-bcmath \
     +php8-mod-ctype \
+    +php8-mod-filter \
     +php8-mod-xmlreader \
     +php8-mod-xmlwriter \
     +php8-mod-session \