[REF] Refactor Campaign Search form to use standardised getSortID fun…

[seamuslee001]

…ction

Overview

Minor refactor to campaign search form to use a consolidated function to get the sort id

Before

Duplicated code in search form class used to get sort id

After

Centralised standardised functon used to get the sort id

ping @demeritcowboy @eileenmcnaughton

[civibot]

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[eileenmcnaughton]

This is the campaign dashboard isn't it? If so searches still work fine there with this patch

/civicrm/campaign?reset=1&subPage=campaign

[seamuslee001]

yes AFAIK