Always allow rustdoc-json tests to contain long lines

The rustdoc-json test syntax often requires very long lines, so the checks
for long lines aren't really useful.

tests/rustdoc-json/type/dyn.rs

@@ -1,4 +1,3 @@
-// ignore-tidy-linelength
 use std::fmt::Debug;
 
 //@ count "$.index[*][?(@.name=='dyn')].inner.module.items[*]" 3

tests/rustdoc-json/type/fn_lifetime.rs

@@ -1,5 +1,3 @@
-// ignore-tidy-linelength
-
 //@ has "$.index[*][?(@.name=='GenericFn')].inner.type_alias"
 
 //@ ismany "$.index[*][?(@.name=='GenericFn')].inner.type_alias.generics.params[*].name" \"\'a\"

tests/rustdoc-json/type/generic_default.rs

@@ -1,5 +1,3 @@
-// ignore-tidy-linelength
-
 //@ set result = "$.index[*][?(@.name=='Result')].id"
 pub enum Result<T, E> {
     Ok(T),

tests/rustdoc-json/type/hrtb.rs

@@ -1,5 +1,3 @@
-// ignore-tidy-linelength
-
 //@ is "$.index[*][?(@.name=='genfn')].inner.function.generics.where_predicates[0].bound_predicate.type" '{"generic": "F"}'
 //@ is "$.index[*][?(@.name=='genfn')].inner.function.generics.where_predicates[0].bound_predicate.generic_params" '[{"kind": {"lifetime": {"outlives": []}},"name": "'\''a"},{"kind": {"lifetime": {"outlives": []}},"name": "'\''b"}]'
 pub fn genfn<F>(f: F)

tests/rustdoc-json/type/inherent_associated_type.rs

@@ -1,4 +1,3 @@
-// ignore-tidy-linelength
 #![feature(inherent_associated_types)]
 #![allow(incomplete_features)]
 

tests/rustdoc-json/type/inherent_associated_type_bound.rs

@@ -1,4 +1,3 @@
-// ignore-tidy-linelength
 #![feature(inherent_associated_types)]
 #![allow(incomplete_features)]
 

tests/rustdoc-json/type/inherent_associated_type_projections.rs

@@ -1,4 +1,3 @@
-// ignore-tidy-linelength
 #![feature(inherent_associated_types)]
 #![allow(incomplete_features)]