When adding a msg/file header, remove the DELETE attribute

When moving or renewing files, they're first removed and then added and they were being added with the DELETE attribute set. The filenames are displayed in red when staged for deletion/removal, so that's how I noticed. Oops.

src/smblib/smblib.c

@@ -1662,6 +1662,7 @@ int smb_addmsghdr(smb_t* smb, smbmsg_t* msg, int storage)
 
 	msg->idx.offset=(uint32_t)(smb->status.header_offset + l);
 	msg->idx_offset=smb->status.total_msgs;
+	msg->hdr.attr &= ~MSG_DELETE;
 	i=smb_putmsg(smb,msg);
 	if(i==SMB_SUCCESS) {
 		smb->status.last_msg++;