Fix FireFox High Contrast Mode for Radio Schedule

[OlgaLyubin]

Resolves #3323

Overall change:
Made duration border display in FireFox High Contrast Mode.
The reason why outline is used instead of border-top is because during Radio Schedule accessibility swarm UX mentioned that there should be no extra border around the duration button (even if it's invisible) because it adds height.

Before:

After:

Code changes:

• Added outline to duration button.
• Updated snapshots.

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• I have assigned myself to this PR and the corresponding issues
• Automated jest tests added (for new features) or updated (for existing features)
• This PR requires manual testing

[Bopchy]

👍

[Bopchy]

Checked this out in FF and it looks great, however it overrides the transparent border on the Button in IE.

Should confirm whether this is a major concern though

Noted an issue in IE11

[OlgaLyubin]

Fixed so that IE high contrast mode looks like this:

Still not ideal, but since IE is a low priority browser, it can stay like this.

[PriyaKR]

Looks good to me on FF.

Looks as described by Olga on IE11.