Fix search bar selection when coming back to the app (#3065)

Task/Issue URL: https://app.asana.com/0/414709148257752/1207736781372157/f
Tech Design URL:
CC:

Description:

Fix Selection when on the serp anc coming back to the app.

Steps to test this PR:

Press fire button.
Ensure the URL bar is selected and keyboard is up.
Leave the app for 6s.
Come back to the app - search for something.
Tap on search bar - text should not be selected, cursor should be at the end.
Hide keyboard, then background the app for 6s.
Come back to the app -> tap on search bar. Whole text should be selected.
Dismiss keyboard, tap on search again. Text should not be selected.
Navigate to non-serp page.
Tap on the url - it should be selected.

DuckDuckGo/MainViewController.swift

@@ -873,6 +873,8 @@ class MainViewController: UIViewController {
                    currentTab?.url?.absoluteString ?? "<nil>")
             return
         }
+        // Make sure that once query is submitted, we don't trigger the non-SERP flow
+        skipSERPFlow = false
         loadUrl(url)
     }
 

DuckDuckGo/en.lproj/Localizable.strings

@@ -826,7 +826,7 @@
 /* Alert action for starting a file dowload */
 "downloads.alert.action.save-to-downloads" = "Save to Downloads";
 
-/* Cancel download action for alert when trying to cancel the file download */
+/* Cancel download action for downloads */
 "downloads.cancel-download.alert.cancel" = "Cancel";
 
 /* Message for alert when trying to cancel the file download */