bug fix in MMG5_split6(): face tags were taken from the wrong, uninitialized variable #681

Job	Run time
mmg-debug / ci (ubuntu-20.04, off, off, off, off, int32_t)	1h 13m 34s
mmg-debug / ci (ubuntu-20.04, off, off, on, off, int32_t)	1h 0m 50s
mmg-debug / ci (ubuntu-20.04, on, off, on, off, int32_t)	1h 15m 21s
mmg-debug / ci (macos-13, off, off, on, off, int32_t)	32m 17s
mmg-debug / ci (macos-14, off, off, off, on, int32_t)	4m 49s
mmg-debug / ci (macos-13, on, off, on, off, int32_t)	38m 56s
mmg-debug / ci (ubuntu-20.04, on, off, off, off, int32_t)	1h 38m 23s
mmg-debug / ci (macos-latest, off, on, on, off, int32_t)	20m 45s
mmg-debug / ci (macos-13, on, off, off, off, int32_t)	52m 42s
mmg-debug / ci (macos-13, off, off, off, off, int32_t)	46m 28s
mmg-debug / ci (windows-2022, off, off, off, off, int32_t)	52m 21s
mmg-debug / ci (ubuntu-20.04, off, on, on, off, int32_t)	1h 1m 40s
mmg-debug / ci (windows-2022, on, off, off, off, int32_t)	55m 7s
mmg-debug / ci (windows-2022, off, on, off, off, int32_t)	51m 57s
mmg-debug / ci (ubuntu-20.04, off, off, on, on, int64_t)	1h 9m 1s
mmg-debug / ci (ubuntu-20.04, off, off, off, on, int32_t)	4m 15s
mmg-debug / ci (ubuntu-20.04, on, on, on, on, int64_t)	4m 42s
mmg-debug / ci (macos-latest, off, off, off, off, int64_t)	2m 28s
mmg-debug / ci (windows-2022, off, off, off, off, int64_t)	4m 45s
mmg-debug / ci (windows-2022, on, on, off, off, int64_t)	4m 46s
mmg-debug / ci (ubuntu-20.04, off, off, off, off, int64_t)	2m 13s
mmg-debug / ci (macos-14, on, on, on, on, int64_t)	4m 55s
mmg-debug / upload_coverage	4m 11s
	13h 46m 26s

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