Remove the NULL from the end of Kaleidoscope.use

For a while now, `Kaleidoscope.use` does not require a NULL sentinel at
the end. This drops the sentinel instead of adding documentation that
would explain why that NULL is there.

Signed-off-by: Csilla Nagyné Martinák <csilla@csillger.hu>

Model01-Firmware.ino

@@ -292,8 +292,8 @@ void setup() {
     &Macros,
 
     // The MouseKeys plugin lets you add keys to your keymap which move the mouse.
-    &MouseKeys,
-    NULL);
+    &MouseKeys
+  );
 
   // While we hope to improve this in the future, the NumLock plugin
   // needs to be explicitly told which keymap layer is your numpad layer