fix: proper error message when login with wechat fails (#4000)

* fix typo

it should be weixin not qq.

* change error message from weixin to wechat

* remove unnecessary check

src/Adapters/Auth/wechat.js

@@ -8,7 +8,7 @@ function validateAuthData(authData) {
     if (data.errcode == 0) {
       return;
     }
-    throw new Parse.Error(Parse.Error.OBJECT_NOT_FOUND, 'qq auth is invalid for this user.');
+    throw new Parse.Error(Parse.Error.OBJECT_NOT_FOUND, 'wechat auth is invalid for this user.');
   });
 }
 
@@ -34,7 +34,7 @@ function graphRequest(path) {
         resolve(data);
       });
     }).on('error', function () {
-      reject('Failed to validate this access token with weixin.');
+      reject('Failed to validate this access token with wechat.');
     });
   });
 }