Fix filtered search input width for IE

What does this MR do?

The filtered search input width should stretch to fill the container. This works in Chrome, Safari and Firefox but not in IE. This MR fixes the input field so that it stretches to fill the container in IE.

Are there points in the code the reviewer needs to double check?

Please test in all browsers

Why was this MR needed?

Fixes a regression

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Tests
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

Closes #30856 (closed)