Update viseme.md

Removed zh-TW since engineer Yanchang confirmed that Viseme is not supported for zh-TW

Author: garhe

articles/ai-services/speech-service/includes/language-support/viseme.md

@@ -109,7 +109,6 @@ ms.author: Zoubaolian
 | vi-VN           | Vietnamese (Vietnam) |Viseme ID|
 | zh-CN           | Chinese (Mandarin, Simplified)  |Viseme ID <br> Blend shapes|
 | zh-HK           | Chinese (Cantonese, Traditional)|Viseme ID|
-| zh-TW           | Chinese (Taiwanese Mandarin, Traditional)|Viseme ID|