Fix formatting of values with embedded newlines when rfc2047 encoding

Before this patch if a value being encoded had an embedded newline,
the line following the newline would have no leading whitespace,
and the whitespace it did have was encoded into the word.  Now
the existing whitespace gets turned into a blank, the way it does
in other header reformatting, and the _continuation_ws gets added
at the beginning of the encoded line.