barcode controller: Remove quiescence zone left and right

When creating reports with barcode labels, there is simply no space
for excessive quiescence zones.  Let's give control of layout to the
report template, not to the barcode renderer.

addons/report/controllers/main.py

@@ -86,7 +86,7 @@ class ReportController(Controller):
         at the bottom of the output image
         """
         try:
-            barcode = request.registry['report'].barcode(type, value, width=width, height=height, humanreadable=humanreadable)
+            barcode = request.registry['report'].barcode(type, value, width=width, height=height, humanreadable=humanreadable, quiet=0)
         except (ValueError, AttributeError):
             raise exceptions.HTTPException(description='Cannot convert into barcode.')