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webview, css: Fix emoji in bold gets rendered twice.

Use `overflow: hidden` in the emoji `span` tag (webapp also uses it).
html for emoji inside bold formatting is like:

```
<strong>
	<span aria-label="tada" class="emoji emoji-1f389" role="img" title="tada">
		<span aria-label="tada" class="emoji emoji-1f389" role="img" title="tada">
			:tada:
		</span>
	</span>
	some text
</strong>
```

Thus adding `overflow: hidden;` hides the overflow i.e extra emoji.

Fixes: #3321

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