protx_form-V1.15 - Fix for VendorTxCode to add store name automatically

Changed the VendorTxCode so that it now adds your store name to the VendorTxCode automatically
to make your code unique as suggested by theINtoy.

Line 142
Changed $plain = "VendorTxCode=" . date('YmdHis') . "&";
to $plain = "VendorTxCode=" . STORE_NAME . date('YmdHis') . "&";

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