[unity] Minor cleanup of commit 60e67017. See #1316.

spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/SkeletonGraphic/Spine-SkeletonGraphic-Additive.shader

@@ -57,7 +57,6 @@ Shader "Spine/SkeletonGraphic Additive"
 		Blend One One
 		ColorMask [_ColorMask]
 
-		//UsePass "Spine/SkeletonGraphic/NORMAL"
 		Pass
 		{
 			Name "Normal"

spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/SkeletonGraphic/Spine-SkeletonGraphic-Multiply.shader

@@ -57,7 +57,6 @@ Shader "Spine/SkeletonGraphic Multiply"
 		Blend DstColor OneMinusSrcAlpha
 		ColorMask [_ColorMask]
 
-		//UsePass "Spine/SkeletonGraphic/NORMAL"
 		Pass
 		{
 			Name "Normal"

spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/SkeletonGraphic/Spine-SkeletonGraphic-Screen.shader

@@ -57,7 +57,6 @@ Shader "Spine/SkeletonGraphic Screen"
 		Blend One OneMinusSrcColor
 		ColorMask [_ColorMask]
 
-		//UsePass "Spine/SkeletonGraphic/NORMAL"
 		Pass
 		{
 			Name "Normal"