LibJS+LibWeb: Rename Heap::allocate_without_realm to Heap::allocate

Now that the heap has no knowledge about a JavaScript realm and is
purely for managing the memory of the heap, it does not make sense
to name this function to say that it is a non-realm variant.

Libraries/LibWeb/HTML/Scripting/Environments.cpp

@@ -49,7 +49,7 @@ EnvironmentSettingsObject::~EnvironmentSettingsObject()
 void EnvironmentSettingsObject::initialize(JS::Realm& realm)
 {
     Base::initialize(realm);
-    m_module_map = realm.heap().allocate_without_realm<ModuleMap>();
+    m_module_map = realm.heap().allocate<ModuleMap>();
 }
 
 void EnvironmentSettingsObject::visit_edges(Cell::Visitor& visitor)