Remove more commented out MCUs

keyboards/business_card/rules.mk

@@ -1,5 +1,4 @@
 # MCU name
-#MCU = at90usb1286
 MCU = atmega32u4
 
 # Processor frequency.

keyboards/ivy/rules.mk

@@ -1,5 +1,4 @@
 # MCU name
-#MCU = at90usb1287
 MCU = atmega32u4
 
 # Processor frequency.
@@ -64,4 +63,4 @@ API_SYSEX_ENABLE = no
 # Do not enable SLEEP_LED_ENABLE. it uses the same timer as BACKLIGHT_ENABLE
 SLEEP_LED_ENABLE = no    # Breathing sleep LED during USB suspend
 
-DEFAULT_FOLDER = ivy/rev1
+DEFAULT_FOLDER = ivy/rev1