Refetch account info when returning to profile screen

This is almost certainly a duplication of effort when navigating to the profile screen initially, for now, but it means the account details are up to date after you’ve followed/unfollowed, etc, from pages in the same navigation stack.

Fixes IOS-344

Mastodon/Scene/Profile/ProfileViewController.swift

@@ -163,6 +163,12 @@ class ProfileViewController: UIViewController, MediaPreviewableViewController, A
         }.store(in: &subscriptions)
     }
 
+    override func viewWillAppear(_ animated: Bool) {
+        Task {
+            await self.refetchAllData()
+        }
+    }
+
     private func updateDisplay(_ viewModel: ProfileViewModelImmutable) {
         guard isViewLoaded else { return }
         // TODO: careful about resetting things if we failed to push edits