accounting: allow user to choose export mode in Account Statement

for same reasons as 3954133f users
sometimes want a report with not so many details by in spreadsheet
format.

bt5/erp5_accounting/SkinTemplateItem/portal_skins/erp5_accounting/AccountModule_viewAccountStatementReportDialog/your_export.xml

@@ -10,8 +10,6 @@
             <key> <string>delegated_list</string> </key>
             <value>
               <list>
-                <string>css_class</string>
-                <string>hidden</string>
                 <string>title</string>
               </list>
             </value>
@@ -77,10 +75,6 @@
             <key> <string>values</string> </key>
             <value>
               <dictionary>
-                <item>
-                    <key> <string>css_class</string> </key>
-                    <value> <string>hidden_label</string> </value>
-                </item>
                 <item>
                     <key> <string>field_id</string> </key>
                     <value> <string>my_checkbox</string> </value>
@@ -89,10 +83,6 @@
                     <key> <string>form_id</string> </key>
                     <value> <string>Base_viewFieldLibrary</string> </value>
                 </item>
-                <item>
-                    <key> <string>hidden</string> </key>
-                    <value> <int>1</int> </value>
-                </item>
                 <item>
                     <key> <string>target</string> </key>
                     <value> <string>Click to edit the target</string> </value>