Fix incorrect data type in netd bpf program

uid_owner_map was changed to UidOwnerValue type but in two places
it was still treated as the old uint8_t type incorrectly.

Test: atest com.android.cts.net.HostsideRestrictBackgroundNetworkTests#testDataSaverMode_enabled
Bug: 130554570
Bug: 114231106
Change-Id: Ib11cb730136932df1f371714f20642de373bafc3