IOS/USBHost: Skip starting threads when determinism is enabled

The threads can't actually be started when determinism is enabled, as
the behavior would not be deterministic, but Open() still tries to
start the threads and wait, resulting in a deadlock when booting
certain games and homebrew in NetPlay.

Source/Core/Core/IOS/USB/Host.cpp

@@ -35,7 +35,7 @@ USBHost::~USBHost() = default;
 
 IPCCommandResult USBHost::Open(const OpenRequest& request)
 {
-  if (!m_has_initialised)
+  if (!m_has_initialised && !Core::WantsDeterminism())
   {
     StartThreads();
     // Force a device scan to complete, because some games (including Your Shape) only care