ERP5: notebook 4.4.1 does not need argon2-cffi

This fixes:

  Installing jupyter.
  While:
    Installing jupyter.
    Base installation request: ...
    Getting distribution for 'argon2-cffi'.
  Error: Picked: argon2-cffi = 20.1.0

Addition of argon2-cffi in commit 7d1ea024
was a last-minute change to fix jupyter SR.

component/jupyter-py2/buildout.cfg

@@ -16,6 +16,7 @@ parts +=
 max_version = 0
 
 [jupyter]
+extra-eggs =
 python_executable = ${buildout:bin-directory}/${:interpreter}
 
 [download-file-base]

component/jupyter/buildout.cfg

@@ -49,10 +49,12 @@ eggs =
   openpyxl
   sympy
   xlrd
-  ${argon2-cffi:egg}
 # additional eggs for jupyterlab
   jupyterlab
   jupyterlab-launcher
+  ${:extra-eggs}
+extra-eggs =
+  ${argon2-cffi:egg}
 
 interpreter = pythonjupyter