realized that the value list was already supported so reverted

my custom code.  The issue that made me go down this path
is related to the little endian checkbox mysteriously and
inconsistently unchecking and therefore interpreting enum values
wrong...would really like to find this.

dbc/dbcsignaleditor.cpp

@@ -86,9 +86,6 @@ DBCSignalEditor::DBCSignalEditor(QWidget *parent) :
                 case 4:
                     currentSignal->valType = STRING;
                     break;
-                case 5:
-                    currentSignal->valType = VALUE_STRING;
-                    break;
                 }
                 dbcFile->setDirtyFlag();
                 fillSignalForm(currentSignal);
@@ -581,9 +578,6 @@ void DBCSignalEditor::fillSignalForm(DBC_SIGNAL *sig)
     case STRING:
         ui->comboType->setCurrentIndex(4);
         break;
-    case VALUE_STRING:
-        ui->comboType->setCurrentIndex(5);
-        break;
     }
 
     for (int i = 0; i < ui->comboReceiver->count(); i++)