(import) fix YNAB (and other) importers (#1462)

packages/desktop-client/e2e/data/ynab5-demo-budget.json

packages/desktop-client/e2e/onboarding.test.js

...es/desktop-client/src/components/manager/ImportActual.tsx

...ges/desktop-client/src/components/manager/ImportYNAB4.tsx

...ges/desktop-client/src/components/manager/ImportYNAB5.tsx

packages/desktop-client/src/global-events.js

packages/loot-core/src/server/importers/ynab5-types.d.ts

packages/loot-core/src/server/importers/ynab5.ts

packages/loot-core/src/server/main.ts

upcoming-release-notes/1462.md