bug fix in MMG5_split6(): face tags were taken from the wrong, uninitialized variable #669

Job	Run time
mmg-debug / ci (ubuntu-20.04, on, off, on, off, int32_t)	1h 16m 48s
mmg-debug / ci (ubuntu-20.04, on, off, off, off, int32_t)	1h 37m 6s
mmg-debug / ci (ubuntu-20.04, off, off, on, off, int32_t)	1h 1m 7s
mmg-debug / ci (ubuntu-20.04, off, off, off, off, int32_t)	1h 12m 58s
mmg-debug / ci (macos-12, on, off, on, off, int32_t)	1s
mmg-debug / ci (macos-12, on, off, off, off, int32_t)	1s
mmg-debug / ci (macos-12, off, off, on, off, int32_t)	1s
mmg-debug / ci (macos-12, off, off, off, off, int32_t)	1s
mmg-debug / ci (ubuntu-20.04, off, off, off, on, int32_t)	4m 44s
mmg-debug / ci (macos-14, off, off, off, on, int32_t)	5m 41s
mmg-debug / ci (ubuntu-20.04, off, on, on, off, int32_t)	1h 2m 4s
mmg-debug / ci (macos-12, off, on, on, off, int32_t)	1s
mmg-debug / ci (windows-2022, off, off, off, off, int32_t)	57m 46s
mmg-debug / ci (windows-2022, on, off, off, off, int32_t)	53m 49s
mmg-debug / ci (windows-2022, off, on, off, off, int32_t)	53m 29s
mmg-debug / ci (ubuntu-20.04, on, on, on, on, int64_t)	4m 44s
mmg-debug / ci (ubuntu-20.04, off, off, on, on, int64_t)	1h 9m 45s
mmg-debug / ci (ubuntu-20.04, off, off, off, off, int64_t)	2m 20s
mmg-debug / ci (macos-14, on, on, on, on, int64_t)	6m 2s
mmg-debug / ci (macos-12, off, off, off, off, int64_t)	1s
mmg-debug / ci (windows-2022, on, on, off, off, int64_t)	5m 12s
mmg-debug / ci (windows-2022, off, off, off, off, int64_t)	4m 42s
mmg-debug / upload_coverage	0s
	10h 38m 23s

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