Remove references to auto download on watch

[mchowning]

Description

For the refresh setting we were reusing strings from the app on the watch and they included references to auto download, which does not happen on the watch (yet). This updates those strings to not reference auto downloading.

In addition, I took this opportunity to shorten the strings since the watch screen is so small.

Testing Instructions

1. Open the settings on the watch
2. Verify that the text below the "Background refresh" toggle makes sense both when the setting is toggled on and when it is toggled off.

Screenshots or Screencast

Before	After

Checklist

• If this is a user-facing change, I have added an entry in CHANGELOG.md
• Ensure the linter passes (./gradlew spotlessApply to automatically apply formatting/linting)
• I have considered whether it makes sense to add tests for my changes
• All strings that need to be localized are in modules/services/localization/src/main/res/values/strings.xml
• Any jetpack compose components I added or changed are covered by compose previews

I have tested any UI changes...

• with the device set to have a large display and font size
• for accessibility with TalkBack