settings: fix card layout visibility issue

The bottom of the card was not visible.

Change-Id: Ie25366a4e5cf0e12188f8655509aa80b171f3f23

client/src/components/LayoutSettings.tsx

@@ -47,6 +47,7 @@ export default function LayoutSettings({ children, title, text, disableMarginTop
           boxShadow: isMobile ? 'none' : undefined,
           border: isMobile ? 'none' : undefined,
           backgroundColor: isMobile ? theme.ChatInterface.backgroundColor : 'unset',
+          mb: '1px',
         }}
       >
         <CardHeader