update zh-cn/application-dev/reference/arkui-ts/ts-basic-components-image.md.

删除多余变量 width:   height: 
Signed-off-by: N朱怡欣 <yxzhus@isoftstone.com>

zh-cn/application-dev/reference/arkui-ts/ts-basic-components-image.md

@@ -166,8 +166,6 @@ struct ImageExample1 {
 @Entry
 @Component
 struct ImageExample2 {
-  @State width: number = 100
-  @State height: number = 100
 
   build() {
     Column({ space: 10 }) {