Fix crash when editing accounts in a list

Closes #127

Tusker.xcworkspace/xcshareddata/swiftpm/Package.resolved

@@ -2,7 +2,7 @@
   "object": {
     "pins": [
       {
-        "package": "PLCrashReporter",
+        "package": "plcrashreporter",
         "repositoryURL": "https://github.com/microsoft/plcrashreporter",
         "state": {
           "branch": null,

Tusker/Screens/Lists/EditListAccountsViewController.swift

@@ -80,15 +80,15 @@ class EditListAccountsViewController: EnhancedTableViewController {
             
             self.nextRange = pagination?.older
             
-            self.mastodonController.persistentContainer.addAll(accounts: accounts)
-            
-            var snapshot = self.dataSource.snapshot()
-            snapshot.deleteSections([.accounts])
-            snapshot.appendSections([.accounts])
-            snapshot.appendItems(accounts.map { .account(id: $0.id) })
-            
-            DispatchQueue.main.async {
-                self.dataSource.apply(snapshot)
+            self.mastodonController.persistentContainer.addAll(accounts: accounts) {
+                var snapshot = self.dataSource.snapshot()
+                snapshot.deleteSections([.accounts])
+                snapshot.appendSections([.accounts])
+                snapshot.appendItems(accounts.map { .account(id: $0.id) })
+                
+                DispatchQueue.main.async {
+                    self.dataSource.apply(snapshot)
+                }
             }
         }
     }