[MWPW-189545]replace dot media in poster image

[Ruchika4]

• Update media path for poster image in transition screen to avoid akamai mapping on acrobat.adobe.com
• This change is restricted to heic-to-pdf only and nothing else should get impacted as the code is executed only for verb hosted on acrobat.adobe.com but a quick regression can be done on other workflows

Resolves: MWPW-189545

Test URLs:

• Before: https://main--dc-frictionless--adobecom.aem.page/heic-to-pdf?unitylibs=stage
• After: https://main--dc-frictionless--adobecom.aem.page/heic-to-pdf?unitylibs=MWPW-189545

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Commits

• e6acf4c ✅ (latest)
• 5f30844 ✅