[Poll history] Fixing small issue about font style (PSG-1178)

[mnaturel]

Type of change

• Feature
• Bugfix
• Technical
• Other :

Content

Reducing size and increasing the line spacing of the empty list title in poll history screen.

Motivation and context

Feedback from design review.

Screenshots / GIFs

Before	After

Tests

• Go to a poll history of a room with no polls

Tested devices

• Physical
• Emulator
• OS version(s): Android 11

Checklist

• Changes has been tested on an Android device or Android emulator with API 21
• UI change has been tested on both light and dark themes
• Accessibility has been taken into account. See https://github.com/vector-im/element-android/blob/develop/CONTRIBUTING.md#accessibility
• Pull request is based on the develop branch
• Pull request includes a new file under ./changelog.d. See https://github.com/vector-im/element-android/blob/develop/CONTRIBUTING.md#changelog
• Pull request includes screenshots or videos if containing UI changes
• Pull request includes a sign off
• You've made a self review of your PR
• If you have modified the screen flow, or added new screens to the application, you have updated the test UiAllScreensSanityTest.allScreensTest()

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

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