Ignore dynamic type when changing zoom level (#3638)

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Task/Issue URL:
https://app.asana.com/0/1205591970852438/1208863000782015/f
Tech Design URL:
CC:

**Description**:

Ignores dynamic type when changing zoom level.

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**Steps to test this PR**:
1. Play with the new Zoom level setting, with or without customized
Dynamic Type
2. Text size on web pages should exclusively be controlled by the Zoom
level setting, and Dynamic Type should only affect non-webview content

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you expect the reviewer to test, then delete configurations you *know*
do not need explicit testing.

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**Definition of Done (Internal Only)**:

* [ ] Does this PR satisfy our [Definition of
Done](https://app.asana.com/0/1202500774821704/1207634633537039/f)?

**Copy Testing**:

* [ ] Use of correct apostrophes in new copy, ie `’` rather than `'`

**Orientation Testing**:

* [ ] Portrait
* [ ] Landscape

**Device Testing**:

* [ ] iPhone SE (1st Gen)
* [ ] iPhone 8
* [ ] iPhone X
* [ ] iPhone 14 Pro
* [ ] iPad

**OS Testing**:

* [ ] iOS 15
* [ ] iOS 16
* [ ] iOS 17

**Theme Testing**:

* [ ] Light theme
* [ ] Dark theme

---
###### Internal references:
[Software Engineering
Expectations](https://app.asana.com/0/59792373528535/199064865822552)
[Technical Design
Template](https://app.asana.com/0/59792373528535/184709971311943)

DuckDuckGo/TextZoomCoordinator.swift

@@ -110,8 +110,7 @@ final class TextZoomCoordinator: TextZoomCoordinating {
     private func applyTextZoom(_ webView: WKWebView) {
         guard isEnabled else { return }
         let level = textZoomLevel(forHost: webView.url?.host)
-        let dynamicTypeScalePercentage = UIFontMetrics.default.scaledValue(for: 1.0)
-        let viewScale = CGFloat(level.rawValue) / 100 * dynamicTypeScalePercentage
+        let viewScale = CGFloat(level.rawValue) / 100
         webView.applyViewScale(viewScale)
     }