Variable font output filename doesn't use designspace info

[ryanbugden]

It looks like the output filename for a variable font uses the interpolable operator name instead of the VariableFontDescriptor’s filename attribute.

batchRoboFontExtension/source/lib/batchGenerators/variableFontsGenerator/__init__.py

Lines 497 to 502 in be2fd51

	for name, interpolableOperator in operator.getInterpolableUFOOperators(useVariableFonts=True):
	for binaryFormat, postProcessCallback in binaryFormats:
	binaryExtention = binaryFormat.split("-")[0]
	suffix = settings["variableFontsSuffix"]
	fileName = f"{name}{suffix}.{binaryExtention}"