Wrong format of "Declared value" causes a incorrect rate returned by correios webservice

"Declared value" sent to correios webservice would be formated in brazilian decimal instead of american decimal. A little "." (dot) does the correios webservices consider the "Declared value" as thousands when the correct format would be with a "," comma to brazilian decimal format.

For example: 178.50 X 178,50, the webservice expect the second format, sending the first one the value is calculed as 178,500.00.

This bug increase the final quote for the shipping service.