Tweak security key error handling

This reworks error handling of "use security key" so we stop the overall
operation when cancelling access (instead of just the immediate prompt). In
addition, flowing the error to outer catch block also handles resetting state to
re-display the initial verification choices.

Fixes https://github.com/vector-im/element-web/issues/15584

src/SecurityManager.ts

@@ -395,6 +395,8 @@ export async function accessSecretStorage(func = async () => { }, forceReset = f
     } catch (e) {
         SecurityCustomisations.catchAccessSecretStorageError?.(e);
         console.error(e);
+        // Re-throw so that higher level logic can abort as needed
+        throw e;
     } finally {
         // Clear secret storage key cache now that work is complete
         secretStorageBeingAccessed = false;