Issue #16188: Fix lua-script Sprite:playAnimationOnce(animation, args) blink bug (#17583)

Author: Joshua Meng

cocos/scripting/lua-bindings/script/framework/extends/SpriteEx.lua

@@ -27,7 +27,7 @@ local Sprite = cc.Sprite
 function Sprite:playAnimationOnce(animation, args)
     local actions = {}
 
-    local showDelay = args.showDelay or 0
+    local showDelay = args.showDelay
     if showDelay then
         self:setVisible(false)
         actions[#actions + 1] = cc.DelayTime:create(showDelay)