Add cancel button for edit item description (#322)

* Add cancel button for edit item description

* fix lint

Author: yiyione

webportal/src/app/market_detail/components/pivot_card.jsx

@@ -47,6 +47,22 @@ const PivotCard = props => {
           <PivotItemWrapper>
             {isEditingDescription && (
               <>
+                <IconButton
+                  iconProps={{ iconName: 'Cancel' }}
+                  title='Cancel'
+                  ariaLabel='Cancel'
+                  onClick={() => {
+                    setIsEditingDescriptionFalse();
+                    setMarkdown(marketItem.description);
+                  }}
+                  styles={{
+                    root: {
+                      marginTop: '-55px',
+                      marginRight: '25px',
+                      float: 'right',
+                    },
+                  }}
+                />
                 <IconButton
                   iconProps={{ iconName: 'Save' }}
                   title='Save'