fix: gift card example stdlib update

closes #596

examples/acceptance_tests/script_context/validators/mint.ak

@@ -19,28 +19,22 @@ fn assert_purpose(ctx) {
     ctx.transaction.mint
       |> value.without_lovelace
       |> value.policies
-  expect Mint(policy_id) =
-    ctx.purpose
+  expect Mint(policy_id) = ctx.purpose
 
   my_policy_id == policy_id
 }
 
 fn assert_mint(purpose, transaction) {
-  expect Mint(policy_id) =
-    purpose
-  let tokens =
-    value.tokens(transaction.mint, policy_id)
+  expect Mint(policy_id) = purpose
+  let tokens = value.tokens(transaction.mint, policy_id)
 
   when dict.get(tokens, #"666f6f") is {
-    None ->
-      error @"token not found"
-    Some(quantity) ->
-      quantity == 1337
+    None -> error @"token not found"
+    Some(quantity) -> quantity == 1337
   }
 }
 
 fn assert_redeemers(ctx, my_redeemer) {
-  expect Some(redeemer) =
-    dict.get(ctx.transaction.redeemers, ctx.purpose)
+  expect Some(redeemer) = dict.get(ctx.transaction.redeemers, ctx.purpose)
   my_redeemer == redeemer && dict.size(ctx.transaction.redeemers) == 1
 }