division_support: fix the inserted filename

Quotes were added in the database.

my2to3/fixes/fix_division_support.py

@@ -49,7 +49,7 @@ class FixDivisionSupport(BaseFix):
         dict(filename=filename, lineno=lineno, id=id_)
       )
     )
-    insert_support(filename, lineno, id_, status)
+    insert_support(filename[1:-1], lineno, id_, status)
     if should_change:
       add_future(node, 'division')
       operator = Leaf(lib2to3.pgen2.token.DOUBLESLASH, "//")