Fixes #4192 : Added dark mode support to MarkChaptersCompletedActivity, MarkStoriesCompletedActivity and MarkTopicsCompletedActivity

[bhaktideshmukh]

Explanation

Fixes #4192 : Added dark mode support to MarkChaptersCompletedActivity, MarkStoriesCompletedActivity, MarkTopicsCompletedActivity.

Mocks link

• MarkChaptersCompleted -- https://xd.adobe.com/view/c05e9343-60f6-4c11-84ac-c756b75b940f-950d/screen/94b86bff-e3b3-4366-868d-86f997021416/specs/
• MarkStoriesCompleted -- https://xd.adobe.com/view/c05e9343-60f6-4c11-84ac-c756b75b940f-950d/screen/cd294e30-0f97-4f4d-8c6d-ea69f598ee88/specs/
• MarkTopicsCompleted -- https://xd.adobe.com/view/c05e9343-60f6-4c11-84ac-c756b75b940f-950d/screen/6e60bc5f-ba28-4409-a96a-d415daa34c10/specs/

Screenshots

Device: -- Nexus 5X API 29

Default	Dark mode

Default	Dark mode

Default	Dark mode

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.
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For UI-specific PRs only

If your PR includes UI-related changes, then:

• Add screenshots for portrait/landscape for both a tablet & phone of the before & after UI changes
• For the screenshots above, include both English and pseudo-localized (RTL) screenshots (see RTL guide)
• Add a video showing the full UX flow with a screen reader enabled (see accessibility guide)
• Add a screenshot demonstrating that you ran affected Espresso tests locally & that they're passing

[rt4914]

@bhaktideshmukh Suggested changes. Thanks.

[rt4914]

LGTM, Thanks.