correct naming and add comments for test case of custom shortcut.

Bug: 141934188
Change-Id: I69ce5f05214df10e2a376ff68c713efe8874df15
diff --git a/tests/AndroidManifest-common.xml b/tests/AndroidManifest-common.xml
index 6802152..ffa90b9 100644
--- a/tests/AndroidManifest-common.xml
+++ b/tests/AndroidManifest-common.xml
@@ -62,7 +62,7 @@
                 <action android:name="android.appwidget.action.APPWIDGET_CONFIGURE"/>
             </intent-filter>
         </activity>
-        <activity android:name="com.android.launcher3.testcomponent.ShortcutWidgetConfigActivity">
+        <activity android:name="com.android.launcher3.testcomponent.CustomShortcutConfigActivity">
             <intent-filter>
                 <action android:name="android.intent.action.CREATE_SHORTCUT" />
                 <category android:name="android.intent.category.DEFAULT" />