Update morse_server example

Remove call to register/2 since the driver does this internally and the
extra call now causes an error.

Signed-off-by: Winford <[email protected]>

Author: UncleGrumpy

examples/erlang/esp32/morse_server.erl

@@ -116,7 +116,6 @@ get_gpio() ->
     case whereis(gpio) of
         undefined ->
             GPIO = gpio:open(),
-            register(gpio, GPIO),
             GPIO;
         GPIO ->
             GPIO