Fix part of #2480: Fixes 2 Audio Tests

[theMr17]

Explanation

Fixes part of #2480

• Fixes testAudioWifi_ratioExp_audioIcon_audioFragHasDefaultLangAndAutoPlays() by checking default language at the end and testing audio icons in a better way.
• Fixes testAudioWifi_ratioExp_continueInteraction_audioButton_submitAns_feedbackAudioPlays() by scrolling to the continue_interaction_button before performing click on it , as it was positioned at the lower end of the recycler view.

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

[github-actions]

Hi! @theMr17 Welcome to Oppia! Could you please follow the instructions here and sign the CLA Sheet to get started? You'll need to do this before we can accept your PR. Thanks!

[adhiamboperes]

@theMr17, could you please walk me through the solution that you are trying to achieve in this PR?

[theMr17]

@adhiamboperes, By this PR, I am trying to figure out exactly why the tests are failing in #2480 and finding a fix a for it.

[theMr17]

@adhiamboperes PTAL

[oppiabot]

Unassigning @theMr17 since a re-review was requested. @theMr17, please make sure you have addressed all review comments. Thanks!

[oppiabot]

Unassigning @adhiamboperes since the review is done.

[oppiabot]

Hi @theMr17, it looks like some changes were requested on this pull request by @adhiamboperes. PTAL. Thanks!

[adhiamboperes]

Thanks @theMr17! This LGTM.

[oppiabot]

Hi @theMr17, this PR is ready to be merged. Please address any remaining comments prior to merging, and feel free to ask someone to merge your PR once the CI checks pass and you're happy with it. Thanks!