speculative fix for set bars visibility crashes (#3442)

Task/Issue URL:
https://app.asana.com/0/392891325557410/1208558176511823/f
Tech Design URL:
CC:

**Description**:
Speculative fix for related crashes by preventing stack overflow.

**Steps to test this PR**:
1. Run the app and browse sites.  
2. Swipe and down and make sure the bars are hidden/shown as expected
4. Switch orientations and try again
5. Test on phone and iPad

DuckDuckGo.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved

@@ -32,8 +32,8 @@
       "kind" : "remoteSourceControl",
       "location" : "https://github.com/DuckDuckGo/BrowserServicesKit",
       "state" : {
-        "revision" : "e0c0c85c18372f73fb97c5cf070f1de70c906a1f",
-        "version" : "199.1.0"
+        "revision" : "ffcbeb215c53e29b10cf511a98468a4456f6b965",
+        "version" : "199.2.0"
       }
     },
     {
@@ -138,7 +138,7 @@
     {
       "identity" : "swift-argument-parser",
       "kind" : "remoteSourceControl",
-      "location" : "https://github.com/apple/swift-argument-parser",
+      "location" : "https://github.com/apple/swift-argument-parser.git",
       "state" : {
         "revision" : "0fbc8848e389af3bb55c182bc19ca9d5dc2f255b",
         "version" : "1.4.0"

DuckDuckGo/MainViewController.swift

@@ -1735,12 +1735,13 @@ extension MainViewController: BrowserChromeDelegate {
             self.viewCoordinator.navigationBarContainer.alpha = percent
             self.viewCoordinator.tabBarContainer.alpha = percent
             self.viewCoordinator.toolbar.alpha = percent
-
-            self.view.layoutIfNeeded()
         }
 
         if animated {
-            UIView.animate(withDuration: ChromeAnimationConstants.duration, animations: updateBlock)
+            UIView.animate(withDuration: ChromeAnimationConstants.duration) {
+                updateBlock()
+                self.view.layoutIfNeeded()
+            }
         } else {
             updateBlock()
         }