Dont clear selected voice

[sjdallst]

What this PR does

Made it so the user's selection is kept after the list voices is cleared (if possible) @molant

Requirements

• [ NA] My PR follows all applicable accessibility requirements (See .github/ACCESSIBILITY_REQS.md).
• [ NA] My PR follows the CSS code style guidelines (See .github/CSS_STYLE_REQS.md).
• [Y ] I have linted my code using npm run lint:css -- demoDirectoryName/**/*.css and npm run lint:js -- demoDirectoryName/**/*.js, and have fixed the errors.