6137c9ff33
Legacy Lua views might declare a global `css` variable to inject custom styles into the template header. Support this mechanism in the OpenWrt 2020 theme as well. Ref: https://github.com/openwrt/luci/issues/4972 Signed-off-by: Jo-Philipp Wich <jo@mein.io> (cherry picked from commit c5ff3244e92f267e3b7410b3196615f5fec75051)