scx_lavd: Do not set task's time slice to zero at the ops.enqueue() path #6439

Job	Run time
lint	13s
pages	0s
build-kernel	14s
build-kernel-nix / build-kernel	4s
layered-matrix (scx_layered, --disable-topology=false)	3m 33s
layered-matrix (scx_layered, --disable-topology=false, --disable-antistall)	4m 0s
integration-test (scx_bpfland)	3m 53s
rust-test-core (scx_loader)	6m 4s
rust-test-schedulers (scx_bpfland)	10m 19s
layered-matrix (scx_layered, --disable-topology=true)	3m 30s
integration-test (scx_lavd)	4m 15s
rust-test-core (scx_rustland_core)	9m 34s
rust-test-schedulers (scx_lavd)	11m 11s
rust-test-core (scx_stats)	4m 7s
layered-matrix (scx_layered, --disable-topology=true, --disable-antistall)	3m 34s
integration-test (scx_layered)	4m 12s
rust-test-schedulers (scx_layered)	10m 8s
rust-test-core (scx_utils)	10m 10s
rust-test-schedulers (scx_rlfifo)	10m 37s
integration-test (scx_rlfifo)	3m 40s
rust-test-schedulers (scx_rustland)	11m 4s
integration-test (scx_rustland)	4m 22s
rust-test-schedulers (scx_rusty)	9m 8s
integration-test (scx_rusty)	4m 5s
	2h 11m 57s

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