Deinit everything when restarting bt standalone temp sensor (#745)

Without this, you get an error when attempting to reconnect after a restart

Author: will-v-pi

pico_w/bt/standalone/server/server.c

@@ -190,6 +190,11 @@ int main() {
         async_context_wait_for_work_until(cyw43_arch_async_context(), at_the_end_of_time);
     }
 
+    att_server_deinit();
+
+    sm_deinit();
+    l2cap_deinit();
+
     cyw43_arch_deinit();
 
     printf("Press the \"S\" key to Start bluetooth\n");