Fix bootloader definition for namecard2x4 (#8301)

BOOTLOADER needs to be defined as caterina because namecard2x4 uses avrdude for flasher.

keyboards/namecard2x4/rules.mk

@@ -9,7 +9,7 @@ MCU = atmega32u4
 #   QMK DFU      qmk-dfu
 #   ATmega32A    bootloadHID
 #   ATmega328P   USBasp
-BOOTLOADER = atmel-dfu
+BOOTLOADER = caterina
 
 # Build Options
 #   change yes to no to disable