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: I8e6158a06183dbbbd80be704fde3fe55e0d03996
diff --git a/TEST_MAPPING b/TEST_MAPPING
index 254a499..41cb61a 100644
--- a/TEST_MAPPING
+++ b/TEST_MAPPING
@@ -50,7 +50,7 @@
       "name": "keystore2_test"
     },
     {
-      "name": "vpnprofilestore_test"
+      "name": "legacykeystore_test"
     }
   ]
 }