Update vpnprofilestore_test to legacykeystore_test in TEST_MAPPING

The test had been changed to legacykeystore_test from ag/14968529

Bug: 192796637
Test: presubmit
Change-Id: I07fe3afd2b6e174e8859b48952cb3ebe4e8b0b58
diff --git a/TEST_MAPPING b/TEST_MAPPING
index eca742d..17c12a9 100644
--- a/TEST_MAPPING
+++ b/TEST_MAPPING
@@ -14,7 +14,7 @@
       "name": "unicode-xid_device_test_tests_exhaustive_tests"
     },
     {
-      "name": "vpnprofilestore_test"
+      "name": "legacykeystore_test"
     }
   ]
 }