fix compile error caused by unmatched API calls to services

com.unity.uiwidgets/Runtime/widgets/editable_text.cs

                     fontFamily: style.fontFamily,
                     fontSize: style.fontSize,
                     fontWeight: style.fontWeight,
-                    textDirection: _textDirection,
+                    textDirection: _textDirection.Value,
                     textAlign: widget.textAlign
                 );
                 _textInputConnection.setEditingState(localValue);