Stop treating quoted-string arguments as ascii-8bit.

Without UTF8=ACCEPT/IMAP4REV2, only ASCII is legal IMAP, and some servers
do reject 8-bit data in quoted-string productions. With either UTF8=ACCEPT
or IMAP4REV2 enabled, sending UTF-8 is legal.

ASCII-8BIT makes no sense in either case (and causes a warning).

Author: arnt

lib/net/imap/command_data.rb

@@ -74,7 +74,7 @@ def send_string_data(str, tag = nil)
     end
 
     def send_quoted_string(str)
-      put_string('"' + str.gsub(/["\\]/n, "\\\\\\&") + '"')
+      put_string('"' + str.gsub(/["\\]/, "\\\\\\&") + '"')
     end
 
     def send_literal(str, tag = nil)