nrf/mpconfigport.h: Enable MICROPY_KBD_EXCEPTION by default.

ports/nrf/mpconfigport.h

@@ -47,7 +47,7 @@
 #define MICROPY_HELPER_REPL         (1)
 #define MICROPY_REPL_EMACS_KEYS     (0)
 #define MICROPY_REPL_AUTO_INDENT    (1)
-#define MICROPY_KBD_EXCEPTION       (0)
+#define MICROPY_KBD_EXCEPTION       (1)
 #define MICROPY_ENABLE_SOURCE_LINE  (0)
 #define MICROPY_LONGINT_IMPL        (MICROPY_LONGINT_IMPL_MPZ)
 #if NRF51