[Keymap] Bug fix nordic60, enable underglow for VIA firmware (#15616)

Co-authored-by: 4pplet <4pplet@protonmail.com>
Co-authored-by: 4pplet <stefan.ess@gmail.com>

keyboards/kbnordic/nordic60/keymaps/via/rules.mk

@@ -1 +1,2 @@
 VIA_ENABLE = yes
+RGBLIGHT_ENABLE = yes