Updated tests to work with new project tree class

tests/reference/gui/1_nwProject.nwx

@@ -1,5 +1,5 @@
 <?xml version='1.0' encoding='utf-8'?>
-<novelWriterXML appVersion="0.1.5" fileVersion="1.0" timeStamp="2019-06-27 20:31:37">
+<novelWriterXML appVersion="0.4.5" fileVersion="1.0" saveCount="4" autoCount="0" timeStamp="2020-05-07 22:03:17">
   <project>
     <name></name>
     <title></title>
@@ -59,7 +59,7 @@
       <status>New</status>
       <expanded>True</expanded>
     </item>
-    <item handle="2fca346db6561" order="0" parent="44cb730c42048">
+    <item handle="98010bd9270f9" order="0" parent="44cb730c42048">
       <name>New File</name>
       <type>FILE</type>
       <class>CHARACTER</class>
@@ -78,7 +78,7 @@
       <status>New</status>
       <expanded>True</expanded>
     </item>
-    <item handle="02d20bbd7e394" order="0" parent="71ee45a3c0db9">
+    <item handle="0e17daca5f3e1" order="0" parent="71ee45a3c0db9">
       <name>New File</name>
       <type>FILE</type>
       <class>PLOT</class>
@@ -97,7 +97,7 @@
       <status>New</status>
       <expanded>True</expanded>
     </item>
-    <item handle="7688b6ef52555" order="0" parent="811786ad1ae74">
+    <item handle="1a6562590ef19" order="0" parent="811786ad1ae74">
       <name>New File</name>
       <type>FILE</type>
       <class>WORLD</class>