fix: set the radio up for a new config before anything transmits on it

setConfig() swapped the config in and released the radio lock, and apply()
only ran later from save(), so the radio task could send queued jobs with
the new TX pin and settings on a CC1101 that wasn't set up for them.
setConfig() now swaps, saves and applies under one lock and save() goes.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/Web.cpp

@@ -2411,7 +2411,6 @@ void Web::begin() {
       }
       JsonObject obj = json.as<JsonObject>();
       somfy.transceiver.fromJSON(obj);
-      somfy.transceiver.save();
       AsyncJsonResp resp;
       resp.beginResponse(request, g_async_content, sizeof(g_async_content));
       resp.beginObject();