Remove unnecessary null check

Address review comments from aosp/2131752 and aosp/2117045
sConfigurationMap must have a entry for UID_RULES_CONFIGURATION_KEY
because this bpf map is an array

Bug: 217624062
Test: atest BpfNetMapsTest
Change-Id: Ic52623e11c1f53e363416d57c0d8705d5510ef04
2 files changed