community: added autofocus prop to CommunitySelectionSearch

[ptamarit]

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Partially closes inveniosoftware/invenio-communities#1227

Description

The "Search in all communities" input in the community front page is currently auto-focused (see linked issue).
While it makes sense for the auto-focus to be present in a model, it does not in a community front page where this is not the only input and it is lower in the page.

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