Remove composer step from startup task.

- Now that we use composer to install phing, we no longer need to use phing to install composer.

build.xml

@@ -242,9 +242,6 @@
 
   <!-- Install and Activate VuFind -->
   <target name="startup" description="install and activate demo">
-    <!-- get dependencies -->
-    <phingcall target="composer" />
-
     <!-- set up appropriate read/write permissions for Apache -->
     <exec command="chmod -R a+w ${srcdir}/local/cache" />