[FIX] base: field monetary lose context of t-lang

In monetary field refactoring (3407fb70e4) there was a small issue that
made context lost so the language use to render the field could be
different from the one to render the view.

For example: if the user has english, and print a report using the lang
of a partner in language spanish, the report would use spanish to format
number for all fields but monetary (which would use english).

opw-708197

odoo/addons/base/ir/ir_qweb/fields.py

@@ -340,7 +340,7 @@ class MonetaryConverter(models.AbstractModel):
         if not options.get('display_currency') and field.type == 'monetary' and field.currency_field:
             options['display_currency'] = record[field.currency_field]
 
-        return self.value_to_html(record[field_name], options)
+        return super(MonetaryConverter, self).record_to_html(record, field_name, options)
 
 TIMEDELTA_UNITS = (
     ('year',   3600 * 24 * 365),