Fixes and tweaks to state styles

[jhung]

• I've read the guidelines for Contributing to the Platform Co-op Toolkit
• This isn't a duplicate of an existing pull request

Description

• Fixes Search focus borders appear as different widths #363 - Search focus borders appear as different widths
• Fixes Inversed search button when active should invert #364 - Search inverts when active.
• Fixes Tweak menu button inverse focus and active state style #365 - Menu button inverted focus and active style
• Fixes Radio group selected state styling tweak #368 - Radio group selected state
• Fixes Accordion displays inverse bottom border when control is active and focused #401 - Accordion has bottom border when active

Steps to test

Search button:

1. Test active state of the search button on the following:
   • Search button
   • Search form
   • Home Layout
2. Search focus/active borders should appear consistent on both the input field and search button (see Search focus borders appear as different widths #363). Note: existing issues with box shadow rendering on Firefox may cause outer and inner borders to appear different widths. See In Firefox, active box-shadow causes rendering artifacts #360).
3. The search button should invert when active See Inversed search button when active should invert #364 .

Menu button:

1. Test the focus and active state on the following:
   • Menu button
   • Page layout (mobile)
   • Home layout (mobile)
2. The focus border should be consistent in width and spacing across default and inverted styles. See Tweak menu button inverse focus and active state style #365 .

Radio group:

1. Verify that the checked option in the Radio Group is Blue-500

Accordion:

1. Test the active or focus state for the filter accordion button on the Archive layout.
2. The top border of the next accordion button should not overlap with the active or focus styling (see Accordion displays inverse bottom border when control is active and focused #401)

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