[modular] Disable flaky last_Focus_time integration test

MF-170

Test=none

Change-Id: I6d52c3760866b99ab6279504a838c624cc1a6751
diff --git a/tests/modular_tests.json b/tests/modular_tests.json
index 3700677..38279cb 100644
--- a/tests/modular_tests.json
+++ b/tests/modular_tests.json
@@ -42,6 +42,7 @@
     },
     {
       "name": "last_focus_time",
+      "disabled": true,
       "exec": [
         "fuchsia-pkg://fuchsia.com/basemgr#meta/basemgr.cmx",
         "--test",