try fix incoming text/html in multipart/mixed

src/dc_receive_imf.rs

@@ -47,10 +47,12 @@ pub fn dc_receive_imf(
         server_uid,
     );
 
+    /*
     if std::env::var(crate::DCC_MIME_DEBUG).is_ok() {
         info!(context, "dc_receive_imf: incoming message mime-body:");
         println!("{}", String::from_utf8_lossy(imf_raw));
     }
+    */
 
     let mime_parser = MimeParser::from_bytes(context, imf_raw);
     let mut mime_parser = if let Err(err) = mime_parser {