Fix ingredient parsing to be less obnoxious

src/commands/groceries.rs

@@ -131,10 +131,7 @@ fn prepare_grocery_list(ingredients: &Vec<(Ingredient, Vec<String>)>) -> Result<
     )?;
     writeln!(out)?; // leave an empty line
     for (ingredient, recipes) in ingredients {
-        writeln!(out, "- [ ] {}", ingredient)?;
-        for recipe in recipes {
-            writeln!(out, "  * {}", recipe)?;
-        }
+        writeln!(out, "- [ ] {} ({})", ingredient, recipes.join(", "))?;
     }
 
     Ok(out)