Import by url cancel fix

[mstrasinskis]

Motivation

When imported token validation fails (for reasons other than an invalid ID format or token duplication), clicking the Cancel button does not close the modal, which is undesirable. This happens because the Cancel button only updates showImportTokenModal but does not remove import-ledger-id from the URL, causing the modal to remain open (the logic to open the modal)

Changes

• Remove query params from URL on cancel.
• Drive-by changes: Ensure consistent behavior by dispatching dispatch("nnsClose") before navigating to the already imported token.

Tests

• Added and verified that it fails w/o this fix.

Todos

• Add entry to changelog (if necessary).
  Not necessary.