Bugs 1620175, 1620176: Only variables should be assigned by reference

Another PHP7 issue to fix up - we don't need to reference smarty() as
the bit needing to be referenced the 'new Dwoo_Mahara()' is done
automatically as the 'new' operator returns a reference automatically.

behatnotneeded

Change-Id: Ie0982365cf45d893363f52fcde6043f02869d988
Signed-off-by: Robert Lyon <robertl@catalyst.net.nz>

htdocs/artefact/blog/new/index.php

@@ -106,7 +106,7 @@ $form['elements']['group'] = array('type' => 'hidden', 'value' => ($groupid) ? $
 
 $form = pieform($form);
 
-$smarty =& smarty();
+$smarty = smarty();
 $smarty->assign_by_ref('form', $form);
 $smarty->display('form.tpl');
 exit;

htdocs/artefact/plans/new.php

@@ -34,7 +34,7 @@ else {
     $form = ArtefactTypePlan::get_form();
 }
 
-$smarty =& smarty();
+$smarty = smarty();
 $smarty->assign_by_ref('form', $form);
 $smarty->assign_by_ref('PAGEHEADING', hsc(TITLE));
 $smarty->display('artefact:plans:new.tpl');