[INOYI-13] Location Finder: map marker popups have gray border.

[manachynskyi]

This PR is going to fix gray border in carnation theme in Map marker popups.
Carnation:
http://i.imgur.com/wZw0KZ7.png
Rose:
http://i.imgur.com/4SKc7RC.png

Steps for review

• log in as admin -> set Carnation as default theme /admin/appearance
• visit /locations
• click on any location marker
• make sure that marker popup don't have gray border.

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Thank you for your contribution!

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[gundevel]

Can one of the admins verify this patch? Use "o+k to test" or ''t+est this please" for manual build execution.