app,server: Allow to set the person count when creating a recipe

app/src/recipe_creator.rs

@@ -357,6 +357,7 @@ pub fn RecipeCreator() -> Html {
                         .iter()
                         .map(|rcp_ig: &RecipeIngredient| (rcp_ig.id, rcp_ig.amount / (*pc) as f64))
                         .collect(),
+                    person_count: (*pc) as _,
                     steps: (*s).clone(),
                 },
             )