Enable Promise App Icon in All Apps.

- feature flag defaults to true
- avoid adding additional workspace shortcut if promise shortcut already
  exists
- handle promise app removal in package added callback for success case

Change-Id: I694701e35cc94481a9c337df3a17b1e5aa2c3b4c

src/com/android/launcher3/model/PackageInstallStateChangedTask.java

@@ -62,8 +62,7 @@ public class PackageInstallStateChangedTask extends ExtendedModelTask {
                         if (mInstallInfo.state == PackageInstallerCompat.STATUS_INSTALLING) {
                             promiseAppInfo.level = mInstallInfo.progress;
                             updated = promiseAppInfo;
-                        } else if (mInstallInfo.state == PackageInstallerCompat.STATUS_FAILED
-                                || mInstallInfo.state == PackageInstallerCompat.STATUS_INSTALLED) {
+                        } else if (mInstallInfo.state == PackageInstallerCompat.STATUS_FAILED) {
                             apps.removePromiseApp(appInfo);
                             removed.add(appInfo);
                         }