wxGUI/menu: add r.category into Change category values and labels submenu (merge from trunk, https://trac.osgeo.org/grass/changeset/62730)

git-svn-id: https://svn.osgeo.org/grass/grass/branches/releasebranch_7_0@62731 15284696-431f-4ddb-bdfa-cd5b030d7da7

gui/wxpython/xml/toolboxes.xml

@@ -982,6 +982,9 @@
   <toolbox name="ChangeCategoryValuesAndLabels">
     <label>Change category values and labels</label>
     <items>
+      <module-item name="r.category">
+        <label>Manage category information</label>
+      </module-item>
       <module-item name="d.rast.edit">
         <label>Interactively edit category values</label>
       </module-item>