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
(cherry picked from commit 9460f45c047e49aff7e83ea3496476dd21752e0e)
Merged-In: I9bfe0a1fad29ba1435eeb8b8b2cffa9d385b1cb5
1 file changed