Search bar accessibility issue

[alexarobu]

Describe the bug
A clear and concise description of what the bug is.

Hi, it's been brought to our attention during a recent accessibility test that the search bar on the Search and Editor board pages has an unsupported ARIA attribute (aria-expanded = "false") (see screenshot)

Please NOTE: this doesn't happen on the home page.

I tracked this down to possibly coming from

core-geonetwork/web-ui/src/main/resources/catalog/lib/angular.ext/typeahead.js

Line 85 in e8e0e5b

'aria-expanded': false,

To Reproduce in Google Chrome
Steps to reproduce the behavior:

1. Go to the Search page
2. Right click and go to Inspect
3. Go to Lighthouse
4. Pick the following options: Mode: Navigation (Default); Device: Desktop; Categories: Accessibility
5. Click Analyze page load
6. See error: [aria-*] attributes do not match their roles

Expected behavior
A clear and concise description of what you expected to happen.
https://dequeuniversity.com/rules/axe/4.8/aria-allowed-attr

Screenshots
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Log file
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Desktop (please complete the following information):

• Browser [e.g. chrome, safari]: Chrome
• GeoNetwork Version [e.g. 22]: 4.2.9
• Server Application [e.g. Tomcat 7 with Java 8]: Jetty in Docker

Additional context
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