[LG-5486] fix(chat-window): revert max-width and padding styles (#3174)

* fix(chat-window): revert full-screen styles

* chore(chat-window): changeset

Author: stephl3

.changeset/pink-steaks-give.md

@@ -0,0 +1,5 @@
+---
+'@lg-chat/chat-window': patch
+---
+
+[LG-5486](https://jira.mongodb.org/browse/LG-5486) reverts style changes from [v4.1.4](https://github.com/mongodb/leafygreen-ui/blob/main/chat/chat-window/CHANGELOG.md#414)

chat/chat-window/src/ChatWindow/ChatWindow.styles.ts

@@ -10,12 +10,8 @@ import {
   Variant,
 } from '@leafygreen-ui/tokens';
 
-const CONTAINER_MAX_WIDTH = 800;
-
 const baseContainerStyles = css`
   width: 100%;
-  max-width: ${CONTAINER_MAX_WIDTH}px;
-  padding: 0 ${spacing[800]}px;
   justify-self: center;
   display: flex;
   flex-direction: column;