Ensure newline before reply header

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

@@ -3561,6 +3561,8 @@ public class FragmentCompose extends FragmentBase {
                             Element reply = document.createElement("div");
                             reply.attr("fairemail", "reference");
 
+                            reply.appendElement("br");
+
                             // Build reply header
                             boolean extended_reply = prefs.getBoolean("extended_reply", false);
                             Element p = ref.getReplyHeader(context, document, extended_reply);