Fix clear bug in BANCStar example code.

Before (from PDF version):

    057: First Name = First Name
    058: Middle = Middle
    059: Last = Last
    060: Name = Full Name
    061: If Last is Null
    062:   Name = First Name + Middle + Last

note the obvious bug in line 61; clearly, we should be checking if "Name" is
null (that is, "Full Name" was null), not "Last", before reconstructing
a standard "Full Name" based on individual components.

PDF will also need to be updated. I recommend correction fluid and a fine-
tipped marker.