Update stylesheet to work with XmlMind

"screen" is used by XmlMind, so needs XXE css

cf. giellalt/dict-sme-nob#2

src/all_smesmj.xml

@@ -1,6 +1,7 @@
-<?xml version='1.0' encoding='UTF-8'?>
-<?xml-stylesheet title="Dictionary view" media="screen,tv,projection" href="../../giella-core/dicts/scripts/gt_dictionary.css" type="text/css"?>
-<?xml-stylesheet alternate="yes" title="Hierarchical view" media="screen,tv,projection" href="../../giella-core/dicts/scripts/gt_dictionary_alt.css" type="text/css"?>
+<?xml-stylesheet media="screen"              title="Dictionary view"   href="../../giella-core/dicts/scripts/gt_dictionary_XXE.css"     type="text/css"?>
+<?xml-stylesheet media="screen"              title="Hierarchical view" href="../../giella-core/dicts/scripts/gt_dictionary_XXE_alt.css" type="text/css" alternate="yes" ?>
+<?xml-stylesheet media="print,tv,projection" title="Dictionary view"   href="../../giella-core/dicts/scripts/gt_dictionary.css"         type="text/css"?>
+<?xml-stylesheet media="print,tv,projection" title="Hierarchical view" href="../../giella-core/dicts/scripts/gt_dictionary_alt.css"     type="text/css" alternate="yes" ?>
 <!DOCTYPE r PUBLIC "-//DivvunGiellatekno//DTD Dictionaries//Multilingual" "../../giella-core/dicts/scripts/gt_dictionary.dtd">
 <r xmlns:xhtml="http://www.w3.org/1999/xhtml" id="smesmj" xml:lang="sme">
    <lics xmlns:xhtml="http://www.w3.org/1999/xhtml" xml:space="preserve"><lic xml:lang="en">