discover: use namespace in xsd type declaration

webpivottable uses xsd: prefix to convert types. Without this, measure
dimension is not detected as measure.

olapy/core/services/xmla_discover_xsds.py

@@ -422,7 +422,7 @@ xmlns:sql="urn:schemas-microsoft-com:xml-sql">
             <xsd:element minOccurs="0" name="DIMENSION_GUID" sql:field="DIMENSION_GUID" type="uuid"/>
             <xsd:element minOccurs="0" name="DIMENSION_CAPTION" sql:field="DIMENSION_CAPTION" type="string"/>
             <xsd:element minOccurs="0" name="DIMENSION_ORDINAL" sql:field="DIMENSION_ORDINAL" type="unsignedInt"/>
-            <xsd:element minOccurs="0" name="DIMENSION_TYPE" sql:field="DIMENSION_TYPE" type="short"/>
+            <xsd:element minOccurs="0" name="DIMENSION_TYPE" sql:field="DIMENSION_TYPE" type="xsd:short"/>
             <xsd:element minOccurs="0" name="DIMENSION_CARDINALITY" sql:field="DIMENSION_CARDINALITY" type="unsignedInt"/>
             <xsd:element minOccurs="0" name="DEFAULT_HIERARCHY" sql:field="DEFAULT_HIERARCHY" type="string"/>
             <xsd:element minOccurs="0" name="DESCRIPTION" sql:field="DESCRIPTION" type="string"/>