Enable texture format overlay on the fly.

Source/Core/VideoCommon/Src/TextureCacheBase.cpp

@@ -98,6 +98,7 @@ void TextureCache::OnConfigChanged(VideoConfig& config)
 			HiresTextures::Init(SConfig::GetInstance().m_LocalCoreStartupParameter.m_strUniqueID.c_str());
 
 		SetHash64Function(g_ActiveConfig.bHiresTextures || g_ActiveConfig.bDumpTextures);
+		TexDecoder_SetTexFmtOverlayOptions(g_ActiveConfig.bTexFmtOverlayEnable, g_ActiveConfig.bTexFmtOverlayCenter);
 	}
 
 	// TODO: Probably shouldn't clear all render targets here, just mark them dirty or something.