changed PathManager python template prop to static

actually gets rid of un-necessary initialisation of new `PreferenceSettings` or `PathManager` classes, see DynamoDS/Dynamo#8034 (review)
forgot the PathManager in last commit.

src/DynamoCore/Configuration/PathManager.cs

@@ -76,7 +76,7 @@ class PathManager : IPathManager
         private readonly string backupDirectory;
         private readonly string preferenceFilePath;
         private readonly string galleryFilePath;
-        private readonly string pythonTemplateFilePath;
+        private static string pythonTemplateFilePath;
 
         private readonly List<string> rootDirectories;
         private readonly HashSet<string> nodeDirectories;
@@ -597,6 +597,11 @@ private IEnumerable<string> LibrarySearchPaths(string library)
             yield return Path.GetFullPath(library);
         }
 
+        internal static string GetPythonTemplatePath()
+        {
+            return pythonTemplateFilePath;
+        }
+
         #endregion
     }
 }

src/DynamoCore/Configuration/PreferenceSettings.cs

@@ -331,7 +331,7 @@ public PreferenceSettings()
             ShowDetailedLayout = true;
             NamespacesToExcludeFromLibrary = new List<string>();
 
-            PythonTemplateFilePath = new PathManager(new PathManagerParams()).PythonTemplateFilePath;
+            PythonTemplateFilePath = PathManager.GetPythonTemplatePath();
 
             BackupInterval = 60000; // 1 minute
             BackupFilesCount = 1;