When toggling extended file descriptions with the 'T' command, save user

Save the user's "misc" flags to the userbase when they use the 'T' command from the batch flagging prompt. Without this change, the option would automatically revert if/when the user record was re-read (which can happen at any time).

src/sbbs3/listfile.cpp

@@ -494,6 +494,7 @@ int sbbs_t::batchflagprompt(smb_t* smb, file_t** bf, ulong* row, uint total
 			return(3);
 		if(ch=='T') {
 			useron.misc ^= EXTDESC;
+			putuserrec(&cfg, useron.number, U_MISC, 0, ultoa(useron.misc,str,16));
 			return 2;
 		}
 		if(ch=='B' || ch=='D') {    /* Flag for batch download */