katana60: fix bootloader size to work with PCB

Fix the bootloader size so the `RESET` key actually resets to the
bootloader instead of just restarting the boards.

keyboards/katana60/rules.mk

@@ -45,7 +45,7 @@ OPT_DEFS += -DINTERRUPT_CONTROL_ENDPOINT
 #   Atmel DFU loader 4096
 #   LUFA bootloader  4096
 #   USBaspLoader     2048
-OPT_DEFS += -DBOOTLOADER_SIZE=512
+OPT_DEFS += -DBOOTLOADER_SIZE=4096
 
 
 # Build Options