[Glitch] Ensure tabIndex is number instead of string

Port ec0c104bf2 to glitch-soc

Signed-off-by: Claire <claire.github-309c@sitedethib.com>

app/javascript/flavours/glitch/features/report/components/option.jsx

@@ -40,7 +40,7 @@ export default class Option extends React.PureComponent {
 
         <span
           className={classNames('poll__input', { active: checked, checkbox: multiple })}
-          tabIndex='0'
+          tabIndex={0}
           role='radio'
           onKeyPress={this.handleKeyPress}
           aria-checked={checked}