web: set WSGIProcessGroup inside Directory

Don't alter server-wide configuration, just kojiweb.

Fixes: https://pagure.io/koji/issue/2695

www/conf/kojiweb.conf

@@ -5,11 +5,11 @@ Alias /koji "/usr/share/koji-web/scripts/wsgi_publisher.py"
 # Python 3 Cheetah expectes unicode everywhere, apache's default lang is C
 # which is not sufficient to open our templates
 WSGIDaemonProcess koji lang=C.UTF-8
-WSGIProcessGroup koji
 
 <Directory "/usr/share/koji-web/scripts/">
     Options ExecCGI
     SetHandler wsgi-script
+    WSGIProcessGroup koji
     WSGIApplicationGroup %{GLOBAL}
     # ^ works around an OpenSSL issue
     # see: https://cryptography.io/en/latest/faq/#starting-cryptography-using-mod-wsgi-produces-an-internalerror-during-a-call-in-register-osrandom-engine