remove unity 2017 related changes

Author: vkovec

Assets/FbxExporters/Editor/ExportModelEditorWindow.cs

@@ -41,9 +41,8 @@ public abstract class ExportOptionsEditorWindow : EditorWindow
             protected float m_fbxExtLabelWidth;
 
             protected virtual void OnEnable(){
-                if (Application.unityVersion.Contains ("2018")) {
-                    InitializeReceiver ();
-                }
+                InitializeReceiver ();
+
                 m_showOptions = true;
                 this.minSize = new Vector2 (SelectableLabelMinWidth + LabelWidth + BrowseButtonWidth, MinWindowHeight);
 
@@ -125,14 +124,12 @@ protected void OnGUI ()
                 // Increasing the label width so that none of the text gets cut off
                 EditorGUIUtility.labelWidth = LabelWidth;
 
-                if (Application.unityVersion.Contains ("2018")) {
-                    GUILayout.BeginHorizontal ();
-                    GUILayout.FlexibleSpace ();
-                    if (EditorGUILayout.DropdownButton (presetIcon, FocusType.Keyboard, presetIconButton)) {
-                        ShowPresetReceiver ();
-                    }
-                    GUILayout.EndHorizontal ();
+                GUILayout.BeginHorizontal ();
+                GUILayout.FlexibleSpace ();
+                if (EditorGUILayout.DropdownButton (presetIcon, FocusType.Keyboard, presetIconButton)) {
+                    ShowPresetReceiver ();
                 }
+                GUILayout.EndHorizontal ();
 
                 EditorGUILayout.LabelField("Naming");
                 EditorGUI.indentLevel++;