add watch_reset_to_bootloader function (resolves #81)

watch-library/simulator/watch/watch.c

@@ -7,3 +7,7 @@ bool watch_is_buzzer_or_led_enabled(void) {
 bool watch_is_usb_enabled(void) {
     return true;
 }
+
+void watch_reset_to_bootloader(void) {
+    // No bootloader in the simulator; nothing to do here
+}