Schedule: In sessions with multiple speakers show picture in front of speaker image for each single speaker

[odkhang]

This PR closes/references issue #135 . It does so by update the css for session view

How has this been tested?

Checklist

• I have added tests to cover my changes.

Summary by Sourcery

Enhanced the session view to show speaker images in front of each speaker's name for sessions with multiple speakers, improving the visual representation of speaker information.

• Enhancements:
  • Updated the session view to display speaker images in front of each speaker's name for sessions with multiple speakers.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request addresses issue #135 by updating the CSS for the session view to display the picture in front of the speaker image for each individual speaker in sessions with multiple speakers.

File-Level Changes

Files	Changes
src/pretalx/static/agenda/js/pretalx-schedule.js	Updated cache identifiers and modified the 'Session.vue' component to enhance the display of speaker images and names in sessions with multiple speakers.

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[odkhang]

[sourcery-ai]

Hey @odkhang - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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