[Cleanup]: Fix Android Studio Warnings: 14 files changes

[lakshay6907]

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Fixes

• Fixes #

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• [ ] You have a descriptive commit message with a short title (first line, max 50 chars).
• [ ] You have commented your code, particularly in hard-to-understand areas
• [ ] You have performed a self-review of your own code
• [ ] UI changes: include screenshots of all affected screens (in particular showing any new or changed strings)
• [ ] UI Changes: You have tested your change using the Google Accessibility Scanner

[welcome[bot]]

First PR! 🚀 We sincerely appreciate that you have taken the time to propose a change to AnkiDroid! Please have patience with us as we are all volunteers - we will get to this as soon as possible.

[github-actions[bot]]

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