Fix #5251: Modify Feature Flag Names to reflect those on Oppia Web

[Tejas-67]

Explanation

Modified feature flag names as proposed to reflect those on oppia web.

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).

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)
• For PRs introducing new UI elements or color changes, both light and dark mode screenshots must be included
• Add a screenshot demonstrating that you ran affected Espresso tests locally & that they're passing

[Tejas-67]

@adhiamboperes please check.

[adhiamboperes]

@Tejas-67, I have taken a look, but the PR is still in draft. Are you still doing some work on it?

[adhiamboperes]

This LGTM @Tejas-67!

[oppiabot]

Assigning @BenHenning for code owner reviews. Thanks!