Flush the bus info cache in more places

The current approach 'works', but better err on the safe side. Once this
caching layer is no longer necessary we should just remove it.

src/plugin/bridges/vst3.cpp

@@ -85,9 +85,15 @@ Vst3PluginBridge::Vst3PluginBridge()
                 },
                 [&](const YaComponentHandler::RestartComponent& request)
                     -> YaComponentHandler::RestartComponent::Response {
-                    return plugin_proxies.at(request.owner_instance_id)
-                        .get()
-                        .component_handler->restartComponent(request.flags);
+                    Vst3PluginProxyImpl& proxy_object =
+                        plugin_proxies.at(request.owner_instance_id).get();
+
+                    // To err on the safe side, we'll just always clear out bus
+                    // info cache whenever a plugin requests a restart
+                    proxy_object.clear_bus_cache();
+
+                    return proxy_object.component_handler->restartComponent(
+                        request.flags);
                 },
                 [&](const YaComponentHandler2::SetDirty& request)
                     -> YaComponentHandler2::SetDirty::Response {