fix: enable bootmagic with simple yes option

Co-authored-by: Drashna Jaelre <drashna@live.com>

keyboards/hhkb/yang/rules.mk

@@ -10,7 +10,7 @@ BOOTLOADER = lufa-ms
 # Build Options
 #   change yes to no to disable
 #
-BOOTMAGIC_ENABLE = lite     # Virtual DIP switch configuration
+BOOTMAGIC_ENABLE = yes      # Enable Bootmagic Lite
 MOUSEKEY_ENABLE = yes       # Mouse keys
 EXTRAKEY_ENABLE = yes       # Audio control and System control
 CONSOLE_ENABLE = no         # Console for debug