Fix #4546: ListItemLeadingMarginSpanTest moved to shared test

[veena14cs]

Fix #4552

Explanation

This PR fixes #4552. ListItemLeadingMarginSpanLocalTest is moved under shared test as it requires to support shadows.

Essential Checklist

• The PR title and explanation each start with "Fix #bugnum: " (If this PR fixes part of an issue, prefix the title with "Fix part of #bugnum: ...".)
• Any changes to scripts/assets files have their rationale included in the PR explanation.
• The PR follows the style guide.
• The PR does not contain any unnecessary code changes from Android Studio (reference).
• The PR is made from a branch that's not called "develop" and is up-to-date with "develop".
• The PR is assigned to the appropriate reviewers (reference).

[BenHenning]

Thanks @veena14cs! This LGTM.