Ref #8078: Fix collapsed URL bar background color (#8202)

The tabs bar now has a background and in general colors around these have changed so we can now just set the alpha of the tabs bar entirely instead of the subviews alone

Sources/Brave/Frontend/Browser/BrowserViewController.swift

@@ -2446,7 +2446,7 @@ public class BrowserViewController: UIViewController {
           topToolbar.locationContainer.alpha = 1
           topToolbar.actionButtons.forEach { $0.alpha = topToolbar.locationContainer.alpha }
           header.collapsedBarContainerView.alpha = 1 - topToolbar.locationContainer.alpha
-          tabsBar.view.subviews.forEach { $0.alpha = topToolbar.locationContainer.alpha }
+          tabsBar.view.alpha = topToolbar.locationContainer.alpha
           toolbar?.actionButtons.forEach { $0.alpha = topToolbar.locationContainer.alpha }
         }
         animator.startAnimation()
@@ -2469,7 +2469,7 @@ public class BrowserViewController: UIViewController {
         toolbarBottomConstraint?.update(offset: min(footerHeight, max(0, footerHeight * (1 - progress))))
       }
       topToolbar.actionButtons.forEach { $0.alpha = topToolbar.locationContainer.alpha }
-      tabsBar.view.subviews.forEach { $0.alpha = topToolbar.locationContainer.alpha }
+      tabsBar.view.alpha = topToolbar.locationContainer.alpha
       header.collapsedBarContainerView.alpha = 1 - topToolbar.locationContainer.alpha
       toolbar?.actionButtons.forEach { $0.alpha = topToolbar.locationContainer.alpha }
       return
@@ -2484,7 +2484,7 @@ public class BrowserViewController: UIViewController {
       topToolbar.locationContainer.alpha = 0
       toolbarBottomConstraint?.update(offset: footerHeight)
     }
-    tabsBar.view.subviews.forEach { $0.alpha = topToolbar.locationContainer.alpha }
+    tabsBar.view.alpha = topToolbar.locationContainer.alpha
     topToolbar.actionButtons.forEach { $0.alpha = topToolbar.locationContainer.alpha }
     header.collapsedBarContainerView.alpha = 1 - topToolbar.locationContainer.alpha
     toolbar?.actionButtons.forEach { $0.alpha = topToolbar.locationContainer.alpha }