clean up a tiny TODO with the COSE Optional tag
diff --git a/test/qcbor_encode_tests.c b/test/qcbor_encode_tests.c
index d87b4e4..dd56791 100644
--- a/test/qcbor_encode_tests.c
+++ b/test/qcbor_encode_tests.c
@@ -828,7 +828,7 @@
    
    QCBOREncode_Init(&ECtx, UsefulBuf_FROM_BYTE_ARRAY(spBigBuf));
    QCBOREncode_OpenArray(&ECtx);
-   
+
    QCBOREncode_AddSimple(&ECtx, CBOR_SIMPLEV_TRUE);
    QCBOREncode_AddSimple(&ECtx, CBOR_SIMPLEV_FALSE);
    QCBOREncode_AddSimple(&ECtx, CBOR_SIMPLEV_NULL);
@@ -1808,7 +1808,7 @@
    QCBOREncode_Init(&EC, UsefulBuf_FROM_BYTE_ARRAY(spBigBuf));
    
    // top level array for cose sign1, 18 is the tag for COSE sign
-   QCBOREncode_AddTag(&EC, 18); // TODO: replace with constant
+   QCBOREncode_AddTag(&EC, CBOR_TAG_COSE_SIGN1);
    QCBOREncode_OpenArray(&EC);
    
    // Add protected headers