bug: slider on range input has black outline on iOS

**Type**: <span ionic-type>bug</span>

**Platform**: <span ionic-platform>ios</span> <span ionic-platform-version>8</span>  <span ionic-webview>webview</span>

<span ionic-description>Slider on range input has a black outline/border on iOS devices. This does not show up in the browser or on Android devices. Fixed by adding:</span>
```
outline: none;
border: none;
```
to  `input[type="range"]::-webkit-slider-thumb` in ionic.css file.

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