Remove debug message about pruning active leaves #13908

Job	Run time
preflight / preflight	36s
preflight / ci-versions	58s
test-linux-stable-runtime-benchmarks	28m 50s
test-linux-stable-no-try-runtime (1/2)	38m 6s
test-linux-stable-no-try-runtime (2/2)	28m 11s
test-linux-stable (1/3, parity-large)	35m 8s
test-linux-stable-int	7m 43s
test-linux-stable (1/3, parity-oldlinux)	34m 34s
test-linux-stable (2/3, parity-large)	25m 21s
test-linux-stable (2/3, parity-oldlinux)	20m 49s
test-linux-stable (3/3, parity-large)	25m 33s
test-linux-stable (3/3, parity-oldlinux)	17m 46s
All tests passed	1s
	4h 23m 36s

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