Make log more explicit when param is changed

src/mavsdk/core/mavlink_parameter_subscription.cpp

@@ -30,7 +30,7 @@ void MavlinkParameterSubscription::find_and_call_subscriptions_value_changed(
         if (subscription.param_name != param_name) {
             continue;
         }
-        LogDebug() << "Param " << param_name << " changed";
+        LogDebug() << "Param " << param_name << " changed to " << value;
         // We have a subscription on this param name, now check if the subscription is for the right
         // type and call the callback when matching
         if (std::get_if<ParamFloatChangedCallback>(&subscription.callback) && value.get_float()) {