[Minimal HUN] Show always sender name in messaging hun

Bug: 336229954
Flag: android.app.Flags.compact_heads_up_notification
Test: SystemUITest and manual
Change-Id: Iedf0fb9b4770fe38d0f5f83a976ecbfad6ed1c89

core/java/android/app/Notification.java

@@ -8918,10 +8918,9 @@ public class Notification implements Parcelable
                 sender = stripStyling(sender);
             }
-            final boolean showOnlySenderName = showOnlySenderName();
-
             final CharSequence title;
-            boolean isConversationTitleAvailable = !showOnlySenderName && conversationTitle != null;
+            final boolean isConversationTitleAvailable = showConversationTitle()
+                    && conversationTitle != null;
             if (isConversationTitleAvailable) {
                 title = conversationTitle;
             } else {
@@ -8941,10 +8940,10 @@ public class Notification implements Parcelable
             }
         }
-        /** developer settings to always show sender name */
-        private boolean showOnlySenderName() {
+        /** (b/342370742) Developer settings to show conversation title. */
+        private boolean showConversationTitle() {
             return SystemProperties.getBoolean(
-                    "persist.compact_heads_up_notification.show_only_sender_name",
+                    "persist.compact_heads_up_notification.show_conversation_title_for_group",
                     false);
         }