Move all code to set default text font into the Config class

tests/conftest.py

@@ -49,6 +49,7 @@ def resetConfigVars():
     """
     CONFIG.setLastPath(_TMP_ROOT)
     CONFIG.setBackupPath(_TMP_ROOT)
+    CONFIG.setTextFont(None)
     CONFIG._homePath = _TMP_ROOT
     CONFIG.guiLocale = "en_GB"
     return

tests/reference/baseConfig_novelwriter.conf

@@ -1,5 +1,5 @@
 [Meta]
-timestamp = 2022-11-11 12:48:18
+timestamp = 2023-05-31 10:52:21
 
 [Main]
 theme = default
@@ -29,7 +29,7 @@ backuponclose = False
 askbeforebackup = True
 
 [Editor]
-textfont = None
+textfont = 
 textsize = 12
 width = 700
 margin = 40

tests/test_gui/test_gui_doceditor.py

@@ -56,7 +56,7 @@ def testGuiEditor_Init(qtbot, nwGUI, projPath, ipsumText, mockRnd):
     assert nwGUI.docEditor._typPadChar == nwUnicode.U_NBSP
 
     # Check that editor handles settings
-    CONFIG.textFont = None
+    CONFIG.textFont = ""
     CONFIG.doJustify = True
     CONFIG.showTabsNSpaces = True
     CONFIG.showLineEndings = True