Fixes failing CTS tests for custom description in save dialog.

Screenshots showing no changes from before: http://shortn/_n52tNerWx6

Test: atest CtsAutofillServiceTestCases; screenshots on pixel/foldable/tablet
Bug: b/301709010
Change-Id: If63c566d1acc2e9064d634ee96e0c7d48c1baf87
Merged-In: I29f9bcf58462d4a570f395594ab83d94fcbaff55