The isExported option should only apply to files

tests/reference/gui/2_nwProject.nwx

@@ -1,5 +1,5 @@
 <?xml version='1.0' encoding='utf-8'?>
-<novelWriterXML appVersion="0.5" fileVersion="1.0" saveCount="2" autoCount="0" timeStamp="2020-05-10 19:35:53">
+<novelWriterXML appVersion="0.5" fileVersion="1.0" saveCount="2" autoCount="0" timeStamp="2020-05-10 23:19:00">
   <project>
     <name>Project Name</name>
     <title>Project Title</title>
@@ -46,7 +46,6 @@
       <class>NOVEL</class>
       <status>New</status>
       <expanded>False</expanded>
-      <exported>True</exported>
     </item>
     <item handle="25fc0e7096fc6" order="0" parent="73475cb40a568">
       <name>New Chapter</name>
@@ -54,7 +53,6 @@
       <class>NOVEL</class>
       <status>New</status>
       <expanded>False</expanded>
-      <exported>True</exported>
     </item>
     <item handle="31489056e0916" order="0" parent="25fc0e7096fc6">
       <name>New Scene</name>
@@ -75,7 +73,6 @@
       <class>CHARACTER</class>
       <status>New</status>
       <expanded>False</expanded>
-      <exported>True</exported>
     </item>
     <item handle="71ee45a3c0db9" order="2" parent="None">
       <name>Plot</name>
@@ -83,7 +80,6 @@
       <class>PLOT</class>
       <status>New</status>
       <expanded>False</expanded>
-      <exported>True</exported>
     </item>
     <item handle="811786ad1ae74" order="3" parent="None">
       <name>World</name>
@@ -91,7 +87,6 @@
       <class>WORLD</class>
       <status>New</status>
       <expanded>False</expanded>
-      <exported>True</exported>
     </item>
   </content>
 </novelWriterXML>