[Board Item] Update

**Problem**
Difficulty recognizing selected items

**Solution**
Change board item background color: white -> blue200

**Figma / Jira Link**
https://www.figma.com/file/IS6P8y1Wn2nfBC4jGlSiya/Components?node-id=7449%3A396920&t=SXp3ePmVnajgeWg5-1

**Additional Description**
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