Bug fixes

[MartijnBogaert]

OPH-286

Corresponding PR:
app-openproceshuis: lblod/app-openproceshuis#22

These bugs were fixed:

• The process step types dropdown filter showed incorrect options
• The process step types dropdown filter didn't show all 45 process step types
• None of the dropdown filters filtered out archived processes/process steps
• The processes dropdown filter didn't work anymore after a previous commit
• The processes filter didn't allow for searching on description
• The process filter on the shared processes page didn't filter out processes published by another organization