CIF to CIF eliminate component definition/instantiation crashes for CompInstWrapType

While working on #222 (closed), I discovered that the following CIF file crashes the transformation in the development version:

group def Y():
  group def Q():
  end
end

y: Y();

group def X1(y.Q p):
   group def X():
     group def T():
     end
   end
end

java.lang.RuntimeException: Invalid comp def type.
	at org.eclipse.escet.cif.cif2cif.ElimComponentDefInst.walkCompInstWrapType(ElimComponentDefInst.java:587)
	at org.eclipse.escet.cif.metamodel.java.CifWalker.walkCifType(CifWalker.java:946)
	at org.eclipse.escet.cif.metamodel.java.CifWalker.walkComponentParameter(CifWalker.java:1617)
	at org.eclipse.escet.cif.metamodel.java.CifWalker.walkParameter(CifWalker.java:5024)
	at org.eclipse.escet.cif.metamodel.java.CifWalker.walkComponentDef(CifWalker.java:1394)
	at org.eclipse.escet.cif.metamodel.java.CifWalker.walkSpecification(CifWalker.java:5986)
	at org.eclipse.escet.cif.cif2cif.ElimComponentDefInst.transform(ElimComponentDefInst.java:171)
	at org.eclipse.escet.cif.typechecker.CifTypeChecker.transRoot(CifTypeChecker.java:209)
	at org.eclipse.escet.cif.typechecker.CifTypeChecker.transRoot(CifTypeChecker.java:1)
	at org.eclipse.escet.common.typechecker.TypeChecker.typeCheck(TypeChecker.java:201)
	at org.eclipse.escet.common.typechecker.EcoreTypeChecker.typeCheck(EcoreTypeChecker.java:40)
	at org.eclipse.escet.common.typechecker.EcoreTypeChecker.typeCheck(EcoreTypeChecker.java:1)
	at org.eclipse.escet.setext.texteditorbase.GenericTextEditor.validateInternal(GenericTextEditor.java:579)
	at org.eclipse.escet.setext.texteditorbase.GenericTextEditor.validate(GenericTextEditor.java:414)
	at org.eclipse.escet.setext.texteditorbase.GenericTextEditor$DelayedValidate.run(GenericTextEditor.java:773)