Fix bug where closing quote was not removed

[tec]

I have seen many (manually edited) csv files in the wild that are formatted to visually have commas like columns. Example:

title ,description ,number value, more text,number 2 line 1,"short, precise" ,5 , sometimes,1 line 2,"a long, long description" ,6 , even,2 line 3,"an even longer description with many words",5 ,right-aligned,3 line 4, " and crazy stuff " ,5 , columns,3 

The current implementation has some errors with those lines.

This closing quote and the whitespace is not removed (only the last space to be precise):

line 1,"short, precise" ,5 , sometimes,1 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 

This whitespace is not removed even if option trim is enabled (neither is the closing quote)

line 4, " and crazy stuff " ,5 , columns,3 ^^^^^ ^^^^^ 

The pull requests fixes those issues