ZEPPELIN-508 Interpreter binding cancel button doesn't work

[AhyoungRyu]

What is this PR for?

Currently, when there is no change compared with before the interpreter binding setting status, the cancel button in binding page doesn't work. So I fixed this bug.

What type of PR is it?

Bug Fix

Todos

• - Fix the cancel button in interpreter binding page.

Is there a relevant Jira issue?

https://issues.apache.org/jira/browse/ZEPPELIN-508

How should this be tested?

Open the Zeppelin any notebook page -> Click the interpreter binding button

1. Don't change any binding setting and Just click the cancel button.
2. Or just click twice the interpreter binding button.

Screenshots (if appropriate)

After this PR applied,

Questions:

• Does the licenses files need update? No.
• Is there breaking changes for older versions? No.
• Does this needs documentation? No.

[minahlee]

Just $scope.showSetting = false; wouldn't be enough?
Personally I wouldn't expect alert message in this case.
And after clicking cancel, having 'cancel' and 'ok' button choice feels a bit awkward for me.

[corneadoug]

I agree with Mina, no need for Dialog here

[AhyoungRyu]

Thanks for the review @minahlee @corneadoug.
I applied the reviews. : )

[Leemoonsoo]

Thanks for the fix.
LGTM. I'm merging it into master.