[test] fix SystemUITests

Non-data apps that have a sharedUserId shared with a privileged app and
use privileged permissions need to testOnly.

BUG: 236173905
Fixes: 243736722
BUG: 243736722
Test: atest SystemUITests
Change-Id: I466b4c305fc0882e036298840c04601747882b18
diff --git a/packages/SystemUI/tests/AndroidManifest.xml b/packages/SystemUI/tests/AndroidManifest.xml
index ba28045..0fa3d36 100644
--- a/packages/SystemUI/tests/AndroidManifest.xml
+++ b/packages/SystemUI/tests/AndroidManifest.xml
@@ -53,7 +53,7 @@
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
     <uses-permission android:name="android.permission.REGISTER_WINDOW_MANAGER_LISTENERS" />
 
-    <application android:debuggable="true" android:largeHeap="true"
+    <application android:debuggable="true" android:largeHeap="true" android:testOnly="true"
             android:enableOnBackInvokedCallback="true" >
         <uses-library android:name="android.test.runner" />