Use a display ID that's really invalid.

When WMS for WmTests is set up, it gets the display info from real
DisplayManagerService, which may not only have 1 display when the test
is run. Therefore use Integer#MAX_VALUE to be safe.

Bug: 145836235
Test: atest ActivityRecordTests#testCanBeLaunchedOnDisplay
Change-Id: Ib809f895a86eafe1c1f5bbc511b1d4f0dec31d82

services/tests/wmtests/src/com/android/server/wm/ActivityRecordTests.java

@@ -203,7 +203,7 @@ public class ActivityRecordTests extends ActivityTestsBase {
         // An activity can be launched on default display.
         assertTrue(activity.canBeLaunchedOnDisplay(DEFAULT_DISPLAY));
         // An activity cannot be launched on a non-existent display.
-        assertFalse(activity.canBeLaunchedOnDisplay(DEFAULT_DISPLAY + 1));
+        assertFalse(activity.canBeLaunchedOnDisplay(Integer.MAX_VALUE));
     }
 
     @Test