fix(rux-accordion): CSS issue from Chrome upgrade

[FMorrison87]

Brief Description

This PR corrects a CSS issue with flex-direction and display on rux-accordion-item that was occurring in Chrome version 31.0.6778.70.

JIRA Link

Related Issue

General Notes

Motivation and Context

A user brought this issue to our attention.

Issues and Limitations

Types of changes

• Bug fix
• New feature
• Breaking change

Checklist

• This PR adds or removes a Storybook story.
• I have added tests to cover my changes.
• Regressions are passing and/or failures are documented
• Changes have been checked in evergreen browsers

[changeset-bot]

🦋 Changeset detected

Latest commit: 148bd15

The changes in this PR will be included in the next version bump.

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[micahjones13]

Fixes issue: #1357