Revert "Fixed double decode addresses"

This reverts commit 1f8ff1a3ca.

app/src/main/java/eu/faircode/email/MessageHelper.java

@@ -854,6 +854,7 @@ public class MessageHelper {
         if (header == null)
             return null;
 
+        header = new String(header.getBytes(StandardCharsets.ISO_8859_1));
         Address[] addresses = InternetAddress.parseHeader(header, false);
 
         for (Address address : addresses) {