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: I44f64d9e6aab19d061a3ba75130290d395354cf5
diff --git a/TEST_MAPPING b/TEST_MAPPING
index df48c8d..0f4b68f 100644
--- a/TEST_MAPPING
+++ b/TEST_MAPPING
@@ -8,7 +8,7 @@
       "name": "keystore2_test"
     },
     {
-      "name": "vpnprofilestore_test"
+      "name": "legacykeystore_test"
     }
   ]
 }