Fix placeholder string in header and footer partials

Author: jdkoren

lib/templates/_footer.html

@@ -13,10 +13,10 @@
 
 {{! TODO(jdkoren): unwrap ^useBaseHref sections when the option is removed.}}
 <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
-<script src="{{^useBaseHref}}%%HTMLBASE_dartdoc_internal%%{{/useBaseHref}}static-assets/typeahead.bundle.min.js"></script>
-<script src="{{^useBaseHref}}%%HTMLBASE_dartdoc_internal%%{{/useBaseHref}}static-assets/highlight.pack.js"></script>
-<script src="{{^useBaseHref}}%%HTMLBASE_dartdoc_internal%%{{/useBaseHref}}static-assets/URI.js"></script>
-<script src="{{^useBaseHref}}%%HTMLBASE_dartdoc_internal%%{{/useBaseHref}}static-assets/script.js"></script>
+<script src="{{^useBaseHref}}%%__HTMLBASE_dartdoc_internal__%%{{/useBaseHref}}static-assets/typeahead.bundle.min.js"></script>
+<script src="{{^useBaseHref}}%%__HTMLBASE_dartdoc_internal__%%{{/useBaseHref}}static-assets/highlight.pack.js"></script>
+<script src="{{^useBaseHref}}%%__HTMLBASE_dartdoc_internal__%%{{/useBaseHref}}static-assets/URI.js"></script>
+<script src="{{^useBaseHref}}%%__HTMLBASE_dartdoc_internal__%%{{/useBaseHref}}static-assets/script.js"></script>
 <!-- footer placeholder -->
 
 </body>

lib/templates/_head.html

@@ -23,9 +23,9 @@
   {{! TODO(jdkoren): unwrap ^useBaseHref sections when the option is removed.}}
   <link href="https://fonts.googleapis.com/css?family=Source+Code+Pro:500,400i,400,300|Source+Sans+Pro:400,300,700" rel="stylesheet">
   <link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">
-  <link rel="stylesheet" href="{{^useBaseHref}}%%HTMLBASE_dartdoc_internal%%{{/useBaseHref}}static-assets/github.css">
-  <link rel="stylesheet" href="{{^useBaseHref}}%%HTMLBASE_dartdoc_internal%%{{/useBaseHref}}static-assets/styles.css">
-  <link rel="icon" href="{{^useBaseHref}}%%HTMLBASE_dartdoc_internal%%{{/useBaseHref}}static-assets/favicon.png">
+  <link rel="stylesheet" href="{{^useBaseHref}}%%__HTMLBASE_dartdoc_internal__%%{{/useBaseHref}}static-assets/github.css">
+  <link rel="stylesheet" href="{{^useBaseHref}}%%__HTMLBASE_dartdoc_internal__%%{{/useBaseHref}}static-assets/styles.css">
+  <link rel="icon" href="{{^useBaseHref}}%%__HTMLBASE_dartdoc_internal__%%{{/useBaseHref}}static-assets/favicon.png">
   <!-- header placeholder -->
 </head>