Revert "Correct extraction of Unicode form field names"

This reverts commit 21a17e7e7b030b840aa32277d4657a66843ae25d.

Autoported commit.
Original commit hash: [741b02f7f]

Author: Benoit Lagae

itext/itext.forms/itext/forms/PdfAcroForm.cs

@@ -952,11 +952,11 @@ private IDictionary<String, PdfFormField> IterateFields(PdfArray array, IDiction
                             parentField = PdfFormField.MakeFormField(parentField.GetParent(), document);
                         }
                     }
-                    name = fieldName.GetValue() + "." + index;
+                    name = fieldName.ToUnicodeString() + "." + index;
                     index++;
                 }
                 else {
-                    name = fieldName.GetValue();
+                    name = fieldName.ToUnicodeString();
                 }
                 fields.Put(name, formField);
                 if (formField.GetKids() != null) {

itext/itext.forms/itext/forms/fields/PdfFormField.cs

@@ -1578,12 +1578,12 @@ public virtual PdfString GetFieldName() {
                     ());
                 PdfString pName = parentField.GetFieldName();
                 if (pName != null) {
-                    parentName = pName.GetValue() + ".";
+                    parentName = pName.ToUnicodeString() + ".";
                 }
             }
             PdfString name = GetPdfObject().GetAsString(PdfName.T);
             if (name != null) {
-                name = new PdfString(parentName + name.GetValue());
+                name = new PdfString(parentName + name.ToUnicodeString());
             }
             return name;
         }

port-hash

@@ -1 +1 @@
-07e073ffa9e240b2dc3aab3a5e221c71b6e3e9dd
+741b02f7f7e7ace4fbb526382cf0f30faf0c15e3