Disable the command feature for onekeys (#10366)

There is no way to invoke the command feature while having just a single
physical key, and disabling that feature fixes build for keymaps like
`handwired/onekey/promicro:rgb` without resorting to LTO (the command
feature consumes more than 4900 bytes with avr-gcc 8.4.0).

keyboards/handwired/onekey/rules.mk

@@ -5,7 +5,7 @@ BOOTMAGIC_ENABLE = no       # Virtual DIP switch configuration(+1000)
 MOUSEKEY_ENABLE = yes       # Mouse keys(+4700)
 EXTRAKEY_ENABLE = yes       # Audio control and System control(+450)
 CONSOLE_ENABLE = yes        # Console for debug(+400)
-COMMAND_ENABLE = yes        # Commands for debug and configuration
+COMMAND_ENABLE = no         # Commands for debug and configuration
 # Do not enable SLEEP_LED_ENABLE. it uses the same timer as BACKLIGHT_ENABLE
 SLEEP_LED_ENABLE = yes       # Breathing sleep LED during USB suspend
 # if this doesn't work, see here: https://github.com/tmk/tmk_keyboard/wiki/FAQ#nkro-doesnt-work