Don't cache IHostApplication::getName()

As it turns out there are only two or three functions where we can do
this. It also breaks logging, and this function will probably only be
called once anyways. More consistency is always better.

src/plugin/bridges/vst3-impls/plugin-proxy.h

@@ -130,6 +130,11 @@ class Vst3PluginProxyImpl : public Vst3PluginProxy {
      */
     Steinberg::IPtr<Steinberg::Vst::IComponentHandler> component_handler;
 
+    // The following pointers are cast from `host_context` if `setHostContext()`
+    // has been called
+
+    Steinberg::FUnknownPtr<Steinberg::Vst::IHostApplication> host_application;
+
    private:
     Vst3PluginBridge& bridge;