datapath/loader: fix missing complexity coverage for enable_identity_mark

In commit 10e7899 ("bpf, datapath: switch identity mark option to
runtime config"), ENABLE_IDENTITY_MARK was changed to a load-time config
and removed from the build-time configs of the complexity tests without
being added to the load-time configs. Thus BPF complexity coverage
decreased. As suggested by Julian, always enable the option.

Fixes: 10e7899 ("bpf, datapath: switch identity mark option to runtime config")
Reported-by: Julian Wiedmann <jwi@isovalent.com>
Signed-off-by: Tobias Klauser <tobias@cilium.io>

Author: tklauser

pkg/datapath/loader/verifier_load_test.go

@@ -24,6 +24,7 @@ func setBasePermutations(t *config.Node) {
 	t.TracingIPOptionType = 1
 	t.DebugLB = true
 	t.EventsMapRateLimit = 1000
+	t.EnableIdentityMark = true
 }
 
 func baseLXCPermutations() *loadPermutationBuilder {