Update the prefix of VPN_APP_EXCLUDED in the test

Update the string according to the change in Vpn.java

Bug: 237345836
Test: atest FrameworksNetTests
Change-Id: I9bfe0a1fad29ba1435eeb8b8b2cffa9d385b1cb5
diff --git a/tests/unit/java/com/android/server/connectivity/VpnTest.java b/tests/unit/java/com/android/server/connectivity/VpnTest.java
index 0891ee3..b93bac0 100644
--- a/tests/unit/java/com/android/server/connectivity/VpnTest.java
+++ b/tests/unit/java/com/android/server/connectivity/VpnTest.java
@@ -232,7 +232,7 @@
     private static final int TEST_TUNNEL_RESOURCE_ID = 0x2345;
     private static final long TEST_TIMEOUT_MS = 500L;
     private static final String PRIMARY_USER_APP_EXCLUDE_KEY =
-            "VPN_APP_EXCLUDED_27_com.testvpn.vpn";
+            "VPNAPPEXCLUDED_27_com.testvpn.vpn";
     static final String PKGS_BYTES = getPackageByteString(List.of(PKGS));
     private static final Range<Integer> PRIMARY_USER_RANGE = uidRangeForUser(PRIMARY_USER.id);