Android - Custom popup menus should be converted to Spinners

Description

The Android codebase uses PopupMenu in multiple places where a Spinner would be more appropriate, since PopupMenu is only designed for menus.

Some context: https://github.com/edx/edx-app-android/pull/891#issuecomment-266721269

The popup window itself shouldn't change by this change, and it's unclear if we should be changing the UI of the buttons. may have some thoughts on this.

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Reporter

IbraheemZ

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Story Points

1.5

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Priority

CAT-3
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