[FIX] Visibility of burger menu on certain width (#20736)

Co-authored-by: dougfabris <deefabris@gmail.com>

app/theme/client/imports/components/sidebar/sidebar.css

@@ -98,7 +98,7 @@
 	}
 }
 
-@media (width < 780px) {
+@media (width < 768px) {
 	.sidebar {
 		position: absolute;
 

client/providers/LayoutProvider.tsx

@@ -17,7 +17,7 @@ const LayoutProvider: FC = ({ children }) => {
 			children={children}
 			value={useMemo(
 				() => ({
-					isMobile: !breakpoints.includes('sm'),
+					isMobile: !breakpoints.includes('md'),
 					isEmbedded,
 					showTopNavbarEmbeddedLayout,
 					sidebar: menu,

client/views/room/Header/RoomHeader.js

@@ -20,6 +20,7 @@ const RoomHeader = ({ room, topic }) => {
 	const { isMobile } = useLayout();
 	const avatar = <RoomAvatar room={room} />;
 	const showQuickActions = roomTypes.showQuickActionButtons(room.t);
+
 	return (
 		<Header>
 			{isMobile && (