TextureCache: EFB copies kept across a savestate load on OpenGL too

Loading a state on OpenGL no longer throws the texture cache away after
restoring it: the EFB copies the state carries, the XFB copies among
them, are found again as on the other backends, instead of the next
picture being decoded from RAM, which the copies never wrote, and shown
as garbage.

Source/Core/VideoCommon/TextureCacheBase.cpp

@@ -56,9 +56,6 @@
 #include "VideoCommon/VertexManagerBase.h"
 #include "VideoCommon/VideoCommon.h"
 #include "VideoCommon/VideoConfig.h"
-#ifdef __LIBRETRO__
-#include "VideoCommon/VideoBackendBase.h"
-#endif
 
 static const u64 TEXHASH_INVALID = 0;
 // Sonic the Fighters (inside Sonic Gems Collection) loops a 64 frames animation
@@ -562,16 +559,7 @@ void TextureCacheBase::DoState(PointerWrap& p)
   if (p.IsWriteMode() || p.IsMeasureMode())
     DoSaveState(p);
   else
-  {
     DoLoadState(p);
-#ifdef __LIBRETRO__
-    if (p.IsReadMode() &&
-        g_video_backend && g_video_backend->GetConfigName() == "OGL")
-    {
-      Invalidate();
-    }
-#endif
-  }
 }
 
 void TextureCacheBase::DoSaveState(PointerWrap& p)