Fix Caps Lock LEDs once and for all (#4824)

Fix Caps Lock LEDs once and for all (#4824)

* Check the size of the SET_REPORT packet

If we have two bytes, that probably means the first is a report ID. The 6KRO interface may or may not have one, but the NKRO interface always does, so we need to check this regardless of whether KEYBOARD_SHARED_EP is defined.

* Fix indentation