fix(stat): app 支持渠道channel 获取

uni_modules/uni-stat/utssdk/common/utils/pageInfo.uts

@@ -149,11 +149,11 @@ export const get_version = () : string => {
  * 获取渠道
  */
 export const get_channel = () : string => {
-  // const platformName = get_platform_name()
-  let channel = ''
-  // if (platformName === 'n') {
-  //   channel = plus.runtime.channel
-  // }
+  const platformName = get_platform_name()
+  let channel:string|null= ''
+  if (platformName === 'n') {
+    channel = sysAppBase.channel ?? ''
+  }
   // if (platformName === 'wx') {
   //   // TODO 需要调研小程序二维码渠道如何获取;
   // }