NetPlay: Sync Wiimote extension

Small addition of NetPlay code in Core.cpp was needed to set the
extensions at the right time, as init would override them otherwise.
This solution is more elegant than modifying the user's INI files on
game start.

Source/Core/Core/NetPlayServer.cpp

@@ -42,12 +42,16 @@
 #include "Core/HW/Sram.h"
 #include "Core/HW/WiiSave.h"
 #include "Core/HW/WiiSaveStructs.h"
+#include "Core/HW/WiimoteEmu/WiimoteEmu.h"
+#include "Core/HW/WiimoteReal/WiimoteReal.h"
 #include "Core/IOS/ES/ES.h"
 #include "Core/IOS/FS/FileSystem.h"
 #include "Core/IOS/IOS.h"
 #include "Core/NetPlayClient.h"  //for NetPlayUI
 #include "DiscIO/Enums.h"
+#include "InputCommon/ControllerEmu/ControlGroup/Extension.h"
 #include "InputCommon/GCPadStatus.h"
+#include "InputCommon/InputConfig.h"
 #include "UICommon/GameFile.h"
 
 #if !defined(_WIN32)
@@ -1159,8 +1163,10 @@ bool NetPlayServer::StartGame()
   spac << m_settings.m_OCEnable;
   spac << m_settings.m_OCFactor;
   spac << m_settings.m_ReducePollingRate;
-  spac << m_settings.m_EXIDevice[0];
-  spac << m_settings.m_EXIDevice[1];
+
+  for (auto& device : m_settings.m_EXIDevice)
+    spac << device;
+
   spac << m_settings.m_EFBAccessEnable;
   spac << m_settings.m_BBoxEnable;
   spac << m_settings.m_ForceProgressive;
@@ -1206,6 +1212,16 @@ bool NetPlayServer::StartGame()
   spac << m_settings.m_SyncCodes;
   spac << m_settings.m_SyncAllWiiSaves;
 
+  for (int i = 0; i < m_settings.m_WiimoteExtension.size(); i++)
+  {
+    const int extension =
+        static_cast<ControllerEmu::Extension*>(
+            static_cast<WiimoteEmu::Wiimote*>(Wiimote::GetConfig()->GetController(i))
+                ->GetWiimoteGroup(WiimoteEmu::WiimoteGroup::Extension))
+            ->switch_extension;
+    spac << extension;
+  }
+
   SendAsyncToClients(std::move(spac));
 
   m_start_pending = false;