[BDES-137][bpk-component-mobile-scroll-container] Removed edge fade

[FireRedNinja]

Removed the leading and training indicators as default behavior. Users can still pass leadingIndicatorClassName and trailingIndicatorClassName to add it back in.

Remember to include the following changes:

• Ensure the PR title includes the name of the component you are changing so it's clear in the release notes for consumers of the changes in the version e.g [KOA-123][BpkButton] Updating the colour
• README.md (If you have created a new component)
• Component README.md
• Tests
• Storybook examples created/updated
• Type declaration (.d.ts) files updated
• For breaking changes or deprecating components/properties, migration guides added to the description of the PR. If the guide has large changes, consider creating a new Markdown page inside the component's docs folder and link it here

[github-actions]

	Warnings
⚠️	Package source files (e.g. packages/package-name/src/Component.js) were updated, but snapshots weren't. Have you checked that the tests still pass?

Browser support

If this is a visual change, make sure you've tested it in multiple browsers.

Generated by 🚫 dangerJS against f8b5035

[github-actions]

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[olliecurtis]

Can you ensure the PR title includes

[JIRA Number][Component updated] as per the first item in the checklist

[github-actions]

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[mungodewar]

LGTM