Fix commas after quoted strings
Fix commas after quoted strings

Since parsing basically starts over after a quoted string, a quoted
string followed by a comma was producing a comma as a parsed
token.

It still can't remember if comma-separated parsing was in use
before the quoted string, and will handle space-separated values
after a quoted string strangely, but `DAT "some text", 0` should
work again.

alfie275/DASM