wxGUI: escape ampersand when writing d.wms into workspace, see https://trac.osgeo.org/grass/ticket/3147

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@69445 15284696-431f-4ddb-bdfa-cd5b030d7da7

gui/wxpython/core/workspace.py

@@ -914,6 +914,7 @@ class WriteWorkspaceFile(object):
         """Make value XML-valid"""
         value = value.replace('<', '&lt;')
         value = value.replace('>', '&gt;')
+        value = value.replace('&', '&amp;')
 
         return value