Fix error deleting TCPMSS clamp rule in route agent #5084

Job	Run time
No "Apply suggestions from code review" Commits	3s
Submariner K8s API Code Generation	1m 23s
Commit Message(s)	33s
Go	3m 52s
Dependency Licenses	2m 23s
Markdown Links (modified files)	19s
Markdown	22s
Protobuf Code Generation	35s
Package Documentation	49s
Shell	10s
Variant Analysis	4m 0s
YAML	10s
Vulnerability Scanning	22s
	15m 1s

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