* PLT-4602 Fix horizontal alignment for .close__button
Reduce negative left margin to fix miscalculated center-positioning.
* PLT-4602 Fix dropdown close icon rendering bug on Android
The combination of using a unicode character and a pseudo element was
too problematic, so I added a new custom icon svg CLOSE_ICON that
renders consistently on all browsers.
* PLT-4602 Use font-family fix, remove <svg>
You were correct @hmhealey, the problem was that the unicode characters
were rendering as different fonts: Open Sans and Helvetica Neue!
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