officejs_support_request_ui: moves fields in center group

If we have a dialog with an editor field in bottom group, then dialog
action buttons does not fit on the screen.
Until rjs_gadget_erp5_nojqm.css allows using editor in bottom groups of
dialog, let's put them in center group, because editor in center group
have "normal" size and the action button fits.

bt5/erp5_officejs_support_request_ui/SkinTemplateItem/portal_skins/erp5_officejs_support_request/SupportRequestModule_viewSupportRequestFastInputDialog.xml

@@ -74,16 +74,16 @@
                 <item>
                     <key> <string>bottom</string> </key>
                     <value>
-                      <list>
-                        <string>your_description</string>
-                        <string>your_file</string>
-                      </list>
+                      <list/>
                     </value>
                 </item>
                 <item>
                     <key> <string>center</string> </key>
                     <value>
-                      <list/>
+                      <list>
+                        <string>your_description</string>
+                        <string>your_file</string>
+                      </list>
                     </value>
                 </item>
                 <item>