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/NetPlayClient.cpp

@@ -52,7 +52,9 @@
 #include "Core/Movie.h"
 #include "Core/PowerPC/PowerPC.h"
 #include "Core/WiiRoot.h"
+#include "InputCommon/ControllerEmu/ControlGroup/Extension.h"
 #include "InputCommon/GCAdapter.h"
+#include "InputCommon/InputConfig.h"
 #include "UICommon/GameFile.h"
 #include "VideoCommon/OnScreenDisplay.h"
 #include "VideoCommon/VideoConfig.h"
@@ -558,11 +560,12 @@ unsigned int NetPlayClient::OnData(sf::Packet& packet)
       packet >> m_net_settings.m_OCFactor;
       packet >> m_net_settings.m_ReducePollingRate;
 
-      int tmp;
-      packet >> tmp;
-      m_net_settings.m_EXIDevice[0] = static_cast<ExpansionInterface::TEXIDevices>(tmp);
-      packet >> tmp;
-      m_net_settings.m_EXIDevice[1] = static_cast<ExpansionInterface::TEXIDevices>(tmp);
+      for (auto& device : m_net_settings.m_EXIDevice)
+      {
+        int tmp;
+        packet >> tmp;
+        device = static_cast<ExpansionInterface::TEXIDevices>(tmp);
+      }
 
       packet >> m_net_settings.m_EFBAccessEnable;
       packet >> m_net_settings.m_BBoxEnable;
@@ -611,6 +614,9 @@ unsigned int NetPlayClient::OnData(sf::Packet& packet)
       packet >> m_net_settings.m_SyncCodes;
       packet >> m_net_settings.m_SyncAllWiiSaves;
 
+      for (int& extension : m_net_settings.m_WiimoteExtension)
+        packet >> extension;
+
       m_net_settings.m_IsHosting = m_local_player->IsHost();
       m_net_settings.m_HostInputAuthority = m_host_input_authority;
     }
@@ -2173,6 +2179,23 @@ bool IsSyncingAllWiiSaves()
   return false;
 }
 
+void SetupWiimotes()
+{
+  ASSERT(IsNetPlayRunning());
+  const NetSettings& netplay_settings = netplay_client->GetNetSettings();
+  const PadMappingArray& wiimote_map = netplay_client->GetWiimoteMapping();
+  for (int i = 0; i < netplay_settings.m_WiimoteExtension.size(); i++)
+  {
+    if (wiimote_map[i] > 0)
+    {
+      static_cast<ControllerEmu::Extension*>(
+          static_cast<WiimoteEmu::Wiimote*>(Wiimote::GetConfig()->GetController(i))
+              ->GetWiimoteGroup(WiimoteEmu::WiimoteGroup::Extension))
+          ->switch_extension = netplay_settings.m_WiimoteExtension[i];
+    }
+  }
+}
+
 void NetPlay_Enable(NetPlayClient* const np)
 {
   std::lock_guard<std::mutex> lk(crit_netplay_client);