Fixed autofill filter comparison.

Test: existing CtsAutoFillServiceTestCases pass
Test: filterTextDifferentPrefixes() pass

Fixes: 62377334

Change-Id: I9edaf500adad7e5775994a838410c3f8f6af2b1a

services/autofill/java/com/android/server/autofill/ui/FillUi.java

@@ -489,7 +489,7 @@ final class FillUi {
                         final String value = item.getValue();
                         // No value, i.e. null, matches any filter
                         if (value == null
-                                || value.toLowerCase().contains(constraintLowerCase)) {
+                                || value.toLowerCase().startsWith(constraintLowerCase)) {
                             filteredItems.add(item);
                         }
                     }