prune: remove unused variables (#431)

packages/loot-design/src/components/DateSelect.js

packages/loot-design/src/components/FixedSizeList.js

...ges/loot-design/src/components/RecurringSchedulePicker.js

...t-design/src/components/budget/BudgetMonthCountContext.js

packages/loot-design/src/components/common.js

packages/loot-design/src/components/manager/DeleteFile.js

packages/loot-design/src/components/manager/Import.js

packages/loot-design/src/components/manager/ImportActual.js

packages/loot-design/src/components/mobile/dragdrop.js

packages/loot-design/src/components/mobile/transaction.js

...s/loot-design/src/components/modals/CreateLocalAccount.js

packages/loot-design/src/components/modals/EditField.js

packages/loot-design/src/components/modals/LoadBackup.js

packages/loot-design/src/components/payees.js

packages/loot-design/src/components/sidebar.js

packages/loot-design/src/components/tooltips.js

packages/loot-design/src/setupTests.js