Fix an issue in NPMS blockedReasons computation logic.

If an app does not have the permission to access network
in Restricted mode, we should be removing
ALLOWED_REASON_RESTRICTED_MODE_PERMISSIONS from the uid's
allowedReasons but right now, we end up removing all the
allowedReasons except ALLOWED_REASON_RESTRICTED_MODE_PERMISSIONS
and this could result in sending wrong network state to apps.

Bug: 202213533
Test: atest tests/cts/hostside/src/com/android/cts/net/HostsideRestrictBackgroundNetworkTests.java
Change-Id: Ibcae147bf4ba84ff91ef7038ffef8c33082b82ca
Merged-In: Ibcae147bf4ba84ff91ef7038ffef8c33082b82ca
(cherry picked from commit 259414ef)