bug: unselect person focus indicator on webkit (#2060)

makes the focus indicator visible on webkit browsers when attempting to remove an item from the people picker selected list

Author: gavinbarron

packages/mgt-components/src/components/mgt-people-picker/mgt-people-picker.scss

@@ -207,6 +207,13 @@ mgt-people-picker .root {
           top: 0px;
           border-radius: 12px;
           line-height: 24px;
+
+          &:focus,
+          &:focus-visible {
+            outline-offset: -4px;
+            outline-width: 1px;
+            outline-style: solid;
+          }
         }
       }
     }