Fix: Swiping with new UI & bottom bar (#6155)

Task/Issue URL:
https://app.asana.com/1/137249556945/project/1207418217763355/task/1210392359930072?focus=true

### Description

Fixes an omnibar layout bug with tab swiping when new UI is enabled and
the omnibar position is set to bottom.

### Steps to test this PR

_Feature 1_
- [ ]
- [ ]

### UI changes
| Before  | After |
| ------ | ----- |
!(Upload before screenshot)|(Upload after screenshot)|

Author: 0nko

app/src/main/java/com/duckduckgo/app/browser/omnibar/experiments/FadeOmnibarLayout.kt

@@ -177,8 +177,13 @@ class FadeOmnibarLayout @JvmOverloads constructor(
         if (w != oldw || h != oldh) {
             // This allows the view to adjust to configuration changes, even if it's currently in the focused state.
             // We need to do this after the layout pass that triggered onSizeChanged because there appears to be a race condition
-            // where layout param changes done directly in the onSizeChanged loop are not applied correctly.
-            doOnLayout {
+            // where layout param changes done directly in the onSizeChanged loop are not applied correctly (only applies to TOP omnibar position).
+            if (omnibarPosition == OmnibarPosition.TOP) {
+                doOnLayout {
+                    unlockContentDimensions()
+                }
+            } else {
+                // For BOTTOM omnibar position, we don't wait to doOnLayout because it breaks the omnibar layout with tab swiping
                 unlockContentDimensions()
             }
         }