Scale facet value has wrong scaling

[xtofs]

7.2.4 Scale

states that the values are "variable" and "floating" in lower case, so does the xsd http://docs.oasis-open.org/odata/ns/edm https://docs.oasis-open.org/odata/odata-csdl-xml/v4.02/csd01/schemas/edm.xsd

but https://github.com/OData/odata.net/blob/d6a53364aa1abe65545f6a0d4a9a057581c864ff/src/Microsoft.OData.Edm/Schema/EdmConstants.cs#L66 defines it as "Variabe"

which is used in https://github.com/OData/odata.net/blob/d6a53364aa1abe65545f6a0d4a9a057581c864ff/src/Microsoft.OData.Edm/Csdl/Serialization/EdmModelCsdlSchemaXmlWriter.cs#L286 to write it as uppercase