Print current page name when renaming a page

From experience, when renaming a page, the name is not far from current one (typo, slight update, word missing, etc.). Therefore, for ease of use, actual page name should be displayed by default instead of a blank input.

In template renameStep1.vm

line

        <input type="text" id="newPageName" name="newPageName" value="${escapetool.xml($newname)}" class="panelinput withTip"/>

Should be updated to:

        <input type="text" id="newPageName" name="newPageName" value="${escapetool.xml($doc.name)}" class="panelinput"/>