Small bug when changing display currency

When picking a new display currency in the wallet settings but not confirming it by clicking "Done" (i.e. clicking on "Cancel" or the backdrop) there still is a "Saved" alert, even though the display currency change wasn't actually saved.

No file, test, or entry point is named in the issue. Locate the wallet settings currency picker and trace the Cancel, backdrop, and Done flows; done means changing the currency and cancelling does not show a "Saved" alert, while confirming with "Done" still does.

Written by the indexing model from the issue text.