add margin and tooltip instead of label to new leave meeting button

bigbluebutton-html5/imports/ui/components/nav-bar/leave-meeting-button/component.jsx

@@ -20,7 +20,7 @@ const LeaveMeetingButton = ({ label }) => {
 
   return (
     <Styled.LeaveButton
-      label={label}
+      tooltipLabel={label}
       color="danger"
       size="lg"
       onClick={() => leaveSession()}

bigbluebutton-html5/imports/ui/components/nav-bar/leave-meeting-button/styles.js

@@ -3,6 +3,7 @@ import Button from '/imports/ui/components/common/button/component';
 
 const LeaveButton = styled(Button)`
   border-radius: 1.1rem;
+  margin: 0.5rem;
   font-size: 1rem;
   line-height: 1.1rem;
   font-weight: 400;