Fix omnibar focus issue when Input Screen enabled (#6336)

Task/Issue URL:
https://app.asana.com/1/137249556945/project/488551667048375/task/1210660229808941?focus=true

### Description
- Fixes the omnibar focussing when Input Screen is enabled

### Steps to test this PR

- [ ] Enable Settings > Duck.ai > Search Input
- [ ] Tap on the omnibar
- [ ] Verify that the omnibar is not focussed
- [ ] Go back
- [ ] Try again 😁
- [ ] Verify omnibar never focusses

Author: joshliebe

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

@@ -225,7 +225,17 @@ class FadeOmnibarLayout @JvmOverloads constructor(
             backIcon.gone()
         }
 
-        omniBarClickCatcher.isVisible = viewState.showClickCatcher
+        enableClickCatcher(viewState.showClickCatcher)
+    }
+
+    private fun enableClickCatcher(enabled: Boolean) {
+        omniBarClickCatcher.isVisible = enabled
+
+        omnibarTextInput.apply {
+            isEnabled = !enabled
+            isFocusable = !enabled
+            isFocusableInTouchMode = !enabled
+        }
     }
 
     /**