fix input-group layout on index.html

see bug http://mantis.tokeek.de/view.php?id=391

htroot/index.html

@@ -53,7 +53,7 @@
 	<h2 class="yacy"><a href="#[promoteSearchPageGreeting.homepage]#" class="yacylogo"><img src="#[promoteSearchPageGreeting.largeImage]#" alt="yacy" style="margin: auto;"/></a></h2>
     <h2 class="yacy">#[promoteSearchPageGreeting]#</h2>
 
-    <form class="search" action="yacysearch.html" method="get" id="searchform" accept-charset="UTF-8">
+    <form class="search form-inline" action="yacysearch.html" method="get" id="searchform" accept-charset="UTF-8">
       <fieldset class="maininput">
         <div class="input-group">
           <input name="query" id="search" type="text" size="40" maxlength="80" value="#[former]#" onFocus="this.select()" class="form-control searchinput typeahead" />