Sending the result twice causes an error

[najeira]

What did you do?

Not reproducible, but seems to send error twice under some conditions.
In rare cases, errors are measured in our app crash records.

What did you expect?

https://github.com/line/flutter_line_sdk/blob/master/android/src/main/kotlin/com/linecorp/flutter_line_sdk/LineSdkWrapper.kt#L119

Here, since the method has not returned, the error will be sent again after this. loginResult = null and return true seem necessary after the line.

[onevcat]

Should be fixed in #20