[CredManUi] Updated the spacing between app bar and credential cards.

For create flow, this will be 16dp.

Bug: 271168598
Test: manual (see bug for screenshot)
Change-Id: If43cc1849e42963cce1f5c09fde04452277de7ea
diff --git a/packages/CredentialManager/src/com/android/credentialmanager/createflow/CreateCredentialComponents.kt b/packages/CredentialManager/src/com/android/credentialmanager/createflow/CreateCredentialComponents.kt
index 00b7d00..c0a4ce8 100644
--- a/packages/CredentialManager/src/com/android/credentialmanager/createflow/CreateCredentialComponents.kt
+++ b/packages/CredentialManager/src/com/android/credentialmanager/createflow/CreateCredentialComponents.kt
@@ -325,7 +325,8 @@
             else onBackCreationSelectionButtonSelected,
         )
     }) {
-        item { Divider(thickness = 16.dp, color = Color.Transparent) }
+        item { Divider(thickness = 8.dp, color = Color.Transparent) } // Top app bar has a 8dp
+                                                                      // bottom padding already
         item {
             CredentialContainerCard {
                 Column(verticalArrangement = Arrangement.spacedBy(2.dp)) {