Address IntelliJ warnings in `Interface.scala` #3575

Job	Run time
Version Sync	8s
Nix flake (self-hosted, linux, normal)	7m 8s
Nix flake (macos-13, macos-13)	19m 0s
Nix flake (MacM1, self-macos-12)	26m 47s
Check Java code formatting	2m 4s
K Tests	26m 42s
K Ubuntu Jammy Package	27m 52s
Performace Tests	11m 14s
	2h 0m 55s

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