Toaster pastries and other sweets are now less fun than cocaine

Lowered the fun levels of a number of junk food items that were
previously rivalling cocaine in terms of fun.

- Strawberry toaster pastries: 20 (was 25)
- Blueberry toaster pastries: 15 (was 18)
- Cooked toaster pastry: 20 (was 30!)
- Smores: 20 (was 30!)
- Birthday cake: 15 (was 20)
- Mega-icing cake: 20 (was 30!)

For comparison, cocaine is fun 25, and cigars are fun 15.

This change doesn't promise that these junk foods are balanced, they're
just less unbalanced than they were before. :)

Closes #22354.

data/json/items/comestibles/junkfood.json

@@ -18,15 +18,15 @@
    "charges": 8,
    "flags": [ "EATEN_HOT" ],
    "vitamins": [ [ "vitA", 3 ], [ "iron", 10 ] ],
    "fun": 25
    "fun": 20
  },
  {
    "type": "COMESTIBLE",
    "id": "toastem2",
    "name": "toast-em",
    "copy-from": "toastem",
    "description": "Dry toaster pastries, usually coated with solid frosting, these are blueberry flavored!",
    "fun": 18
    "fun": 15
  },
  {
    "type": "COMESTIBLE",
@@ -66,7 +66,7 @@
    "copy-from": "toasterpastryfrozen",
    "quench": 4,
    "description": "A delicious fruit-filled pastry that you've cooked.  It even comes with frosting!",
    "fun": 30
    "fun": 20
  },
  {
    "type": "COMESTIBLE",
@@ -250,7 +250,7 @@
    "volume": 1,
    "flags": [ "EDIBLE_FROZEN" ],
    "vitamins": [ [ "calcium", 4 ], [ "iron", 6 ] ],
    "fun": 30
    "fun": 20
  },
  {
    "type": "COMESTIBLE",
@@ -466,7 +466,7 @@
    "volume": 8,
    "charges": 12,
    "vitamins": [ [ "calcium", 3 ], [ "iron", 6 ] ],
    "fun": 20
    "fun": 15
  },
  {
    "type": "COMESTIBLE",
@@ -484,7 +484,7 @@
    "stim": 8,
    "quench": -5,
    "description": "A cake coated in the thickest icing you've ever seen.  Someone has written guff in quotation marks on it...",
    "fun": 30
    "fun": 20
  },
  {
    "type": "COMESTIBLE",