Call default zeal60 rgb file

keyboards/hs60/v2/keymaps/stanrc85/rules.mk

@@ -1,5 +1,6 @@
 # project specific files
 SRC =	keyboards/zeal60/zeal60.c \
+    keyboards/zeal60/rgb_backlight.c \
 		drivers/issi/is31fl3733.c \
 		quantum/color.c \
 		drivers/arm/i2c_master.c