ANW-1599: only display help text on top container search form if multiselect is…

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… enabled

Description

only display help text on top container search form if multiselect is enabled.

Multiselect is enabled if top container rows are selectable via checkboxes, and not selectable if top container rows are selectable via radio buttons.

Related JIRA Ticket or GitHub Issue

https://archivesspace.atlassian.net/browse/ANW-1599

How Has This Been Tested?

manual in browser testing

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have read the CONTRIBUTING document.
• I have authority to submit this code.
• I have added tests to cover my changes.
• All new and existing tests passed.