HOME_STACK_ID, ASSISTANT_STACK_ID, and RECENTS_STACK_ID be gone!

Replaced usages with ACTIVITY_TYPE_HOME, ACTIVITY_TYPE_ASSISTANT
and ACTIVITY_TYPE_RECENTS.

Test: go/wm-smoke
Test: Existing tests pass.
Bug: 64146578
Change-Id: I62c55c99df86dba8c9ba9d9986049de1b1083234
diff --git a/services/core/java/com/android/server/wm/TaskSnapshotController.java b/services/core/java/com/android/server/wm/TaskSnapshotController.java
index 751769a..bff24f6 100644
--- a/services/core/java/com/android/server/wm/TaskSnapshotController.java
+++ b/services/core/java/com/android/server/wm/TaskSnapshotController.java
@@ -254,7 +254,7 @@
     @VisibleForTesting
     int getSnapshotMode(Task task) {
         final AppWindowToken topChild = task.getTopChild();
-        if (StackId.isHomeOrRecentsStack(task.mStack.mStackId)) {
+        if (!task.isActivityTypeStandardOrUndefined()) {
             return SNAPSHOT_MODE_NONE;
         } else if (topChild != null && topChild.shouldUseAppThemeSnapshot()) {
             return SNAPSHOT_MODE_APP_THEME;