Updating a page with the REST API makes it non-hidden unless the hidden property is specified

Steps to reproduce:

1. Create a hidden page
2. Execute the following snippet in the browser's console: 

   fetch(require('xwiki-meta').restURL, {
     method: 'PUT',
     headers: {
       'Content-Type': 'application/json',
       'Accept': 'application/json'
     },
     body: JSON.stringify({
       content: 'Updated content'
     })
   })
   .then(response => response.json())
   .then(json => {
     console.log('Response:', json);
   })
   .catch(error => {
     console.error('Error sending PUT request:', error);
   }); 

Expected result:

The page is still hidden but its content is now "Updated content".

Actual result:

The page is no longer hidden and its content is now "Updated content":

The code that causes this has been introduced in XWIKI-12783.