[web] Update the change role icon on web

Summary:
The icon for the change role action item in the members modal is currently a `plus-circle`. After some discussion, we need to use the new `edit-1` icon part of the `CommIcon` component.

`MenuItem` defaults to using a `SWMansionIcon` if a icon name is provided:
```
  let menuItemIcon = iconComponent;
  if (icon) {
    menuItemIcon = <SWMansionIcon size="100%" icon={icon} />;
  }
```

so instead I used the existing `iconComponent` prop to pass in the `CommIcon` we're using.

Test Plan:
The new icon looks as expected

{F632135}

Reviewers: atul, ginsu

Reviewed By: ginsu

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D8479

web/modals/threads/members/member.react.js

@@ -24,10 +24,13 @@ import {
 import ChangeMemberRoleModal from './change-member-role-modal.react.js';
 import css from './members-modal.css';
 import UserAvatar from '../../../avatars/user-avatar.react.js';
+import CommIcon from '../../../CommIcon.react.js';
 import Label from '../../../components/label.react.js';
 import MenuItem from '../../../components/menu-item.react.js';
 import Menu from '../../../components/menu.react.js';
 
+const commIconComponent = <CommIcon size={18} icon="user-edit" />;
+
 type Props = {
   +memberInfo: RelativeMemberInfo,
   +threadInfo: ThreadInfo,
@@ -81,7 +84,7 @@ function ThreadMember(props: Props): React.Node {
             <MenuItem
               key="change_role"
               text="Change Role"
-              icon="plus-circle"
+              iconComponent={commIconComponent}
               onClick={onClickChangeRole}
             />
           );