Limits updating sources to app launch and manually via pull-to-refresh

AltStore/LaunchViewController.swift

@@ -85,6 +85,11 @@ extension LaunchViewController
         AppManager.shared.updatePatronsIfNeeded()
         PatreonAPI.shared.refreshPatreonAccount()
         
+        AppManager.shared.updateAllSources { result in
+            guard case .failure(let error) = result else { return }
+            Logger.main.error("Failed to update sources on launch. \(error.localizedDescription, privacy: .public)")
+        }
+        
         self.updateKnownSources()
         
         WidgetCenter.shared.reloadAllTimelines()