Update BootstrapTextField_holder.ss

Typo in $PrependedText

Author: phillprice

templates/BootstrapTextField_holder.ss

@@ -1,6 +1,6 @@
 <div id="$Name" class="<% if $AppendedText || $PrependedText %>input-group<% end_if %> $HolderClasses" $HolderAttributes>
     <label for="$ID">$Title</label>    
-    <% if $PreprendedText %>
+    <% if $PrependedText %>
         <span class="input-group-addon">$PrependedText</span>
     <% end_if %>