Edit Book: Fix an extra colon being added when setting the "notes" se…

…mantic

src/calibre/gui2/tweak_book/widgets.py

@@ -745,7 +745,7 @@ def create_known_type_map(self):
             'foreword': _('Foreword'),
             'loi': _('List of Illustrations'),
             'lot': _('List of Tables'),
-            'notes:': _('Notes'),
+            'notes': _('Notes'),
             'preface': _('Preface'),
             'text': _('Text'),
         }