Stop using now-unneeded collapsible class for panels

bakerydemo/base/models.py

@@ -344,7 +344,6 @@ class HomePage(Page):
                 ),
             ],
             heading="Featured homepage sections",
-            classname="collapsible",
         ),
     ]
 

bakerydemo/breads/models.py

@@ -131,7 +131,7 @@ class BreadPage(Page):
                 ),
             ],
             heading="Additional Metadata",
-            classname="collapsible collapsed",
+            classname="collapsed",
         ),
     ]