|MU4] Revert renaming of chantCaesura's name

[Jojo-Schmitz]

This is not the name used in SMuFL!
Yes, the glyph is chantCaesura, but the clear text name is "Caesura".
See fonts/smufl/glyphnames.json:

	"chantCaesura": {
		"codepoint": "U+E8F8",
		"description": "Caesura"
	},

Whenever ...tools/fonttools/smufl2sym.{sh,bat} is run again, it'd revert this change.

See #6152, when this got added to 3.x and 7d70696 for master, esp. the commented out code in the mtests checking for duplicates, as in 3.x this was only in the master palette.

I've submitted w3c/smufl#215, maybe this will change in the futur. Until then we have this PR here ;-)