Fix URI field encoding in createUriRecord:

According to NFCForum URI RTD:
"3.2.3 URI Field
The encoding used MUST be UTF-8, unless the URI scheme specifies some 
particular encoding."

libndef/ndefrecord.cpp

@@ -412,7 +412,7 @@ NDEFRecord NDEFRecord::createUriRecord(const QString& uri)
     }
 
     payload.append(uri_identifier);
-    payload.append(uri.right(uri_size - uri_identifier_size));
+    payload.append(uri.right(uri_size - uri_identifier_size).toUtf8());
     record.setPayload(payload);
 
     return record;