remove unused argument (fixes login test)

Author: jnptk

src/plone/restapi/renderer/blocks/title.py

@@ -13,5 +13,5 @@ def __init__(self, context, request):
         self.context = context
         self.request = request
 
-    def __call__(self, block_data):
+    def __call__(self):
         return f"# {self.context.title}"