Fix error to success

Author: yoshimin

android/src/main/kotlin/com/linecorp/flutter_line_sdk/LineSdkWrapper.kt

@@ -182,7 +182,7 @@ class LineSdkWrapper(
                     )
                 )
             } else {
-                result.error(null)
+                result.success(null)
             }
         }
     }