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: Idbdab9af03b5747cb7a71c18f06d2082af563560
diff --git a/TEST_MAPPING b/TEST_MAPPING
index 1b7b681..b678467 100644
--- a/TEST_MAPPING
+++ b/TEST_MAPPING
@@ -14,7 +14,7 @@
       "name": "keystore2_test"
     },
     {
-      "name": "vpnprofilestore_test"
+      "name": "legacykeystore_test"
     },
     {
       "name": "tokio-test_device_test_src_lib"