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: I6d68dc376c5b865e526adff1ef9caca31f349b1c
diff --git a/TEST_MAPPING b/TEST_MAPPING
index 2441f5b..eb9808f 100644
--- a/TEST_MAPPING
+++ b/TEST_MAPPING
@@ -227,7 +227,7 @@
       "name": "tokio_device_test_tests_uds_split"
     },
     {
-      "name": "vpnprofilestore_test"
+      "name": "legacykeystore_test"
     }
   ]
 }