Fix expension of macros in pointers with default values.

For example :

in xsl decl widget_class(%name, *clsname="%nameWidget", match="widget[@type='%name']", mode="widget_class") alias template {
| class `text **clsname` extends Widget{
content;
| }
};

widget_class('Input');

gives now :

<xsl:template match="widget[@type='Input']" mode="widget_class">
<xsl:text>class </xsl:text>
<xsl:text>InputWidget</xsl:text>
<xsl:text> extends Widget{
</xsl:text>
<xsl:text>}
</xsl:text>
</xsl:template>

Without the fix, <xsl:text>InputWidget</xsl:text> would be <xsl:text>%nameWidget</xsl:text>

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include yslt.yml2

     2

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estylesheet {

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    template "/list" cities

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        apply "address[name='Meier']" with "me", ".";

     6

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    template "address" {

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        param "me";

     9

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        call "f" with "addresses", "$me/address[name='Schmid'] | .";

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    }

    12

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    function "f" {

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        param "addresses";

    15

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        foreach "$addresses"

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            city value "city";

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    }

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}