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: Ib06ba7205eb6142484569a58ff111ad914c625f9
diff --git a/TEST_MAPPING b/TEST_MAPPING
index a731acb..2a07b0f 100644
--- a/TEST_MAPPING
+++ b/TEST_MAPPING
@@ -8,7 +8,7 @@
       "name": "libsqlite3-sys_device_test_src_lib"
     },
     {
-      "name": "vpnprofilestore_test"
+      "name": "legacykeystore_test"
     }
   ]
 }