Update SplitButton.js

[joystickjockey]

Fix warnings when building in IntelliJ IDEA

[tananaev]

How come I'm not getting any warnings? Are you using different lint settings?

[joystickjockey]

If you are asking if I have made any changes to .eslintignore or .eslinttrc.json documents the answer is no.

[tananaev]

Then why do you have this warning?

[joystickjockey]

I honestly don't know Anton, lets see if others are getting the same errors. See below:

[tananaev]

The lint check here is successful, so I think it's something on your end:

https://github.com/traccar/traccar-web/actions

[joystickjockey]

any idea where I should look for the issue as I have definitely not made changes to lint settings?

[tananaev]

Actually I tried to run the lint directly and I see it as a warning. Not sure why I'm still able to build everything without any issues.