luci-app-mwan3: extend uci-default to set globals section if not present

Signed-off-by: Florian Eckert <fe@dev.tdt.de>

applications/luci-app-mwan3/root/etc/uci-defaults/60_luci-mwan3

@@ -8,6 +8,13 @@ uci -q batch <<-EOF >/dev/null
 	commit ucitrack
 EOF
 
+uci -q get mwan3.globals >/dev/null || {
+	uci -q add mwan3 globals >/dev/null
+	uci -q rename mwan3.@globals[-1]="globals" >/dev/null
+	uci -q set mwan3.globals.initial_source="none" >/dev/null
+	uci commit mwan3
+}
+
 # remove LuCI cache
 rm -rf /tmp/luci-indexcache /tmp/luci-modulecache