fmt: fix alignment of struct init fields (#22025)

vlib/json/json_test.v

@@ -38,10 +38,10 @@ fn test_field_with_default_expr() {
 	data := '[{"net":1},{"net":2,"currencyId":"cjson"}]'
 	prices := json.decode([]Price, data)!
 	assert prices == [Price{
-		net: 1
+		net:         1
 		currency_id: 'cconst'
 	}, Price{
-		net: 2
+		net:         2
 		currency_id: 'cjson'
 	}]
 }
@@ -80,9 +80,9 @@ struct SomeGame {
 fn test_encode_decode_sumtype() {
 	t := time.now()
 	game := SomeGame{
-		title: 'Super Mega Game'
+		title:  'Super Mega Game'
 		player: Human{'Monke'}
-		other: [
+		other:  [
 			Entity(Item{'Pen'}),
 			Item{'Cookie'},
 			Animal.cat,
@@ -155,7 +155,7 @@ fn test_parse_user() {
 
 fn test_encode_decode_time() {
 	user := User2{
-		age: 25
+		age:      25
 		reg_date: time.new(year: 2020, month: 12, day: 22, hour: 7, minute: 23)
 	}
 	s := json.encode(user)
@@ -173,12 +173,12 @@ fn (mut u User) foo() string {
 
 fn test_encode_user() {
 	mut usr := User{
-		age: 10
-		nums: [1, 2, 3]
-		last_name: 'Johnson'
+		age:           10
+		nums:          [1, 2, 3]
+		last_name:     'Johnson'
 		is_registered: true
-		typ: 0
-		pets: 'foo'
+		typ:           0
+		pets:          'foo'
 	}
 	expected := '{"age":10,"nums":[1,2,3],"lastName":"Johnson","IsRegistered":true,"type":0,"pet_animals":"foo"}'
 	out := json.encode(usr)
@@ -265,30 +265,30 @@ fn test_nested_type() {
 	data := Data{
 		countries: [
 			Country{
-				name: 'UK'
+				name:   'UK'
 				cities: [City{'London'}, City{'Manchester'}]
 			},
 			Country{
-				name: 'KU'
+				name:   'KU'
 				cities: [City{'Donlon'}, City{'Termanches'}]
 			},
 		]
 		users: {
 			'Foo': User{
-				age: 10
-				nums: [1, 2, 3]
-				last_name: 'Johnson'
+				age:           10
+				nums:          [1, 2, 3]
+				last_name:     'Johnson'
 				is_registered: true
-				typ: 0
-				pets: 'little foo'
+				typ:           0
+				pets:          'little foo'
 			}
 			'Boo': User{
-				age: 20
-				nums: [5, 3, 1]
-				last_name: 'Smith'
+				age:           20
+				nums:          [5, 3, 1]
+				last_name:     'Smith'
 				is_registered: false
-				typ: 4
-				pets: 'little boo'
+				typ:           4
+				pets:          'little boo'
 			}
 		}
 		extra: {