Incorrect field focus when creating new Wiki page
### Summary
When a new Wiki page is added, focus remains on the Search field in the main toolbar (CSS: #search) instead of moving to the Page Slug field on the New Wiki Page modal (CSS: #new_wiki_path).
### Steps to reproduce
1. Navigate to a Project's Wiki.
2. Click the 'New Page' button.
3. Begin typing a page name.
### Example Project
This appears to work in any project.
### What is the current *bug* behavior?
When the user begins typing, the input is received by the Search field. If not discovered by the user in time and the [Enter] key is pressed, the search will execute, resulting in a new page being loaded. This forces the user to navigate back to the Wiki to restart the process.
### What is the expected *correct* behavior?
When the New Wiki Page modal is displayed, focus should move to the Page Slug field, allowing the user to instantly input a name, and save via [Enter] key.
issue