RecipeForm assumes that the `recipes` source is enabled

Assigning to @chrisfromredfin for light manual testing. How to test this:

• Place a mini-browser block for the recipes source on some other page that isn't a Project Browser page.
• Use that mini-browser to find and apply a recipe that requires input.
• Apply the recipe, filling out the required input.
• You should be redirected back to the original page, not to the /admin/modules/browse/recipes.

manually tested and confirmed.

backport complete.