Remove duplicated first/last test case from declaration_list.json #383

Job	Run time
Linux (nightly, --features malloc_size_of)	2m 18s
Linux (beta)	35s
Linux (beta, --features dummy_match_byte)	35s
Linux (nightly, --features dummy_match_byte)	2m 13s
Linux (stable)	33s
Linux (stable, --features malloc_size_of)	35s
Linux (stable, --features dummy_match_byte)	35s
Linux (1.68.0, --features dummy_match_byte)	5m 49s
Linux (beta, --features malloc_size_of)	35s
Linux (nightly)	2m 11s
Linux (1.68.0)	5m 42s
Linux (nightly, --features bench)	5m 16s
Linux (nightly, --features bench,dummy_match_byte)	5m 14s
Linux (1.68.0, --features malloc_size_of)	5m 41s
Result	2s
	37m 54s

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