given height and scroll on search sidebar in mobile view

[GauravD2t]

References

• Fixes Search sidebar overflows over the footer in mobile mode on pages with only one result #2563

• Requires DSpace/DSpace#pr-number (if a REST API PR is required to test this)

Description

given height and scroll on Search sidebar overflows over the footer in mobile mode on pages with only one result
@tdonohue

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