MDL-28298 workshop: do not use a constant without explicit inclusion of the library

MDL-28298 workshop: do not use a constant without explicit inclusion of the library

Instead of including whole formslib just to get the constant defined, I
decided to hard-code the value and put the reference to the comment so
that eventual grep would spot it. Of course that is is not nice at all
but it's lesser of two evils imho.