Remove "Apply" buttons in Project Settings

[vkbo]

Summary:

This PR removes the "Apply" button for editing entries in Status and Importance flags, and for Auto-Replace entries. The changes are instead applied immediately.

Related Issue(s):

Closes #2150

Reviewer's Checklist:

• The header of all files contain a reference to the repository license
• The overall test coverage is increased or remains the same as before
• All tests are passing
• All flake8 checks are passing and the style guide is followed
• Documentation (as docstrings) is complete and understandable
• Only files that have been actively changed are committed