Use delcall and deltemplate for footer parts

The docs of footerPoweredBy and footerFormatBadge say it should be
called from custom footer templates as well. However, this doesn't work
as these need to use deltemplate and the fully qualified name to enable
calling from other deltemplates (like customFooter).

This commit fixes that.

Change-Id: If42733ba41488abacb69b57e606360743de06fbc
diff --git a/resources/com/google/gitiles/templates/Common.soy b/resources/com/google/gitiles/templates/Common.soy
index 392f816..6d2e8ed 100644
--- a/resources/com/google/gitiles/templates/Common.soy
+++ b/resources/com/google/gitiles/templates/Common.soy
@@ -110,24 +110,24 @@
  *
  * Please call this in custom variants as well.
  */
-{template .footerPoweredBy}
+{deltemplate gitiles.footerPoweredBy}
 <span class="Footer-poweredBy">
   Powered by <a href="https://gerrit.googlesource.com/gitiles/">Gitiles</a>
 </span>
-{/template}
+{/deltemplate}
 
 /**
  * Footer format badge
  *
  * You can use this in custom footers as well.
  */
-{template .footerFormatBadge}
+{deltemplate gitiles.footerFormatBadge}
 <span class="Footer-formats">
   <a class="u-monospace Footer-formatsItem" href="?format=TEXT">{msg desc="text format"}txt{/msg}</a>
     {sp}
   <a class="u-monospace Footer-formatsItem" href="?format=JSON">{msg desc="JSON format"}json{/msg}</a>
 </span>
-{/template}
+{/deltemplate}
 
 /**
  * Default Footer
@@ -136,8 +136,8 @@
 <!-- default customFooter -->
 <footer class="Site-footer">
   <div class="Footer">
-   {call gitiles.footerPoweredBy /}
-   {call gitiles.footerFormatBadge /}
+   {delcall gitiles.footerPoweredBy /}
+   {delcall gitiles.footerFormatBadge /}
   </div>
 </footer>
 {/deltemplate}
diff --git a/resources/com/google/gitiles/templates/Doc.soy b/resources/com/google/gitiles/templates/Doc.soy
index c938490..d1c0f79 100644
--- a/resources/com/google/gitiles/templates/Doc.soy
+++ b/resources/com/google/gitiles/templates/Doc.soy
@@ -66,7 +66,7 @@
   </div>
   <footer class="Site-footer">
     <div class="Footer">
-      {call gitiles.footerPoweredBy /}
+      {delcall gitiles.footerPoweredBy /}
       <div class="Footer-links">
         {if $sourceUrl}<a class="Footer-link" href="{$sourceUrl}">{msg desc="text for the source link"}source{/msg}</a>{/if}
         {if $logUrl}<a class="Footer-link" href="{$logUrl}">{msg desc="text for the log link"}log{/msg}</a>{/if}