Bug fix: Wrong random seed file default extension

Source commit: 66e09ab610717509b13cd5eb46eb5684ff422aef

source/forms/Preferences.dfm

@@ -1764,7 +1764,7 @@ object PreferencesDialog: TPreferencesDialog
             OnBeforeDialog = PathEditBeforeDialog
             OnAfterDialog = PathEditAfterDialog
             DialogKind = dkSave
-            DefaultExt = 'log'
+            DefaultExt = 'rnd'
             Filter = 'Random seed files (*.rnd)|*.rnd|All files (*.*)|*.*'
             DialogOptions = [ofHideReadOnly, ofPathMustExist]
             DialogTitle = 'Select file for random seed'