Fix crash caused by invalid mix_rate assignment due to bogus

project settings.

We'll default to a sensible value in the case that a user has
somehow managed to modify the configuration file incorrectly.

Closes 69819

drivers/wasapi/audio_driver_wasapi.cpp

@@ -547,7 +547,7 @@ Error AudioDriverWASAPI::finish_input_device() {
 }
 
 Error AudioDriverWASAPI::init() {
-	mix_rate = GLOBAL_GET("audio/driver/mix_rate");
+	mix_rate = _get_configured_mix_rate();
 
 	target_latency_ms = GLOBAL_GET("audio/driver/output_latency");