Improve logging of unknown parameter changes

These messages are only useful for developers, so log at debug level,
not error level.  Also log that property and latency changes are not
implemented yet.

pipewire/qubes-pw-module.c

@@ -724,9 +724,13 @@ static void stream_param_changed(void *data, uint32_t id,
         break;
     case SPA_PARAM_Props:
         /* TODO: reconfigure the stream according to the new properties */
+        pw_log_debug("TODO: reconfigure stream according to new properties");
+        return;
+    case 15 /* SPA_PARAM_Latency */:
+        pw_log_debug("TODO: handling latency changes");
         return;
     default:
-        pw_log_error("Unknown id %" PRIu32, id);
+        pw_log_debug("Unknown id %" PRIu32, id);
         return;
     }