Avoid XmlElementAttribute creation for Properties created via a ref=""

[fabsenet]

potentially a fix for #303

This is only a failing unit test for now

[fabsenet]

I fixed this now!

There was already the correct code in place for this issue for attributes:

XmlSchemaClassGenerator/XmlSchemaClassGenerator/ModelBuilder.cs

Lines 807 to 815 in c52f248

	if (attribute.Form == XmlSchemaForm.None)
	{
	if (attribute.RefName != null && !attribute.RefName.IsEmpty)
	property.Form = XmlSchemaForm.Qualified;
	else
	property.Form = attribute.GetSchema().AttributeFormDefault;
	}
	else
	property.Form = attribute.Form;

which I took for elements as well!

[codecov]

Codecov Report

Merging #304 (c52f248) into master (b351a92) will decrease coverage by 0.02%.
The diff coverage is 85.71%.

@@            Coverage Diff             @@
##           master     #304      +/-   ##
==========================================
- Coverage   95.67%   95.65%   -0.03%     
==========================================
  Files          19       19              
  Lines        3310     3316       +6     
  Branches      484      486       +2     
==========================================
+ Hits         3167     3172       +5     
  Misses         82       82              
- Partials       61       62       +1     

Impacted Files	Coverage Δ
XmlSchemaClassGenerator/ModelBuilder.cs	97.41% <85.71%> (-0.10%)	⬇️

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[mganss]

Thanks!