Send error with fetch device failure pixel (#3546)

Task/Issue URL: https://app.asana.com/0/0/1208738052951188/f

**Description**:

The pixel `sync_refresh_devices_error` didn't include the error
parameter due to confusion about how the slightly newer PixelKit types
do this. This PR just includes the error.

DuckDuckGo/Preferences/Model/SyncPreferences.swift

@@ -376,7 +376,7 @@ final class SyncPreferences: ObservableObject, SyncUI.ManagementViewModel {
                 let registeredDevices = try await syncService.fetchDevices()
                 mapDevices(registeredDevices)
             } catch {
-                PixelKit.fire(DebugEvent(GeneralPixel.syncRefreshDevicesError(error: error)))
+                PixelKit.fire(DebugEvent(GeneralPixel.syncRefreshDevicesError(error: error), error: error))
                 Logger.sync.debug("Failed to refresh devices: \(error)")
             }
         }