Removing rogue bom-ref which should not have been present on inputType in thr xsd

Signed-off-by: Steve Springett <steve@springett.us>

Author: stevespringett

schema/bom-1.5.xsd

@@ -4953,14 +4953,6 @@ limitations under the License.
                 </xs:annotation>
             </xs:any>
         </xs:sequence>
-        <xs:attribute name="bom-ref" type="bom:refType">
-            <xs:annotation>
-                <xs:documentation>
-                    An optional identifier which can be used to reference the trigger elsewhere in the BOM.
-                    Uniqueness is enforced within all elements and children of the root-level bom element.
-                </xs:documentation>
-            </xs:annotation>
-        </xs:attribute>
         <xs:anyAttribute namespace="##any" processContents="lax">
             <xs:annotation>
                 <xs:documentation>User-defined attributes may be used on this element as long as they