kaleidoscope::hid::base::Keyboard: Add a default, no-op sendReport

Signed-off-by: Gergely Nagy <algernon@keyboard.io>

src/kaleidoscope/driver/hid/base/Keyboard.h

@@ -40,7 +40,7 @@ class NoBootKeyboard {
   void setProtocol(uint8_t protocol) {}
   void setDefaultProtocol(uint8_t protocol) {}
 
-  void sendReport();
+  void sendReport() {}
 
   void press(uint8_t code) {}
   void release(uint8_t code) {}