remove incorrect csv separators

The output of the csv export currently looks like this:

    /dev/sda5,69,%,8.7,G,28.0,G,/

The comma between the value and the percent sign or between the value and the unit break the csv layout.  With the incorrect commas removed, it now looks like this:
    
    /dev/sda5,69%,8.7G,28.0G,/