html5: Add option to open Matrix chat at start of bbb

The chat panel had an option startClosed which you can set to false to
start with an open chat panel.  Add the same option to the matrix
chat.

Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

Author: jejb

bigbluebutton-html5/imports/startup/client/base.jsx

@@ -203,6 +203,19 @@ class Base extends Component {
               type: ACTIONS.SET_ID_CHAT_OPEN,
               value: PUBLIC_CHAT_ID,
             });
+          } else if (getFromUserSettings('bbb_show_public_chat_on_login', !Meteor.settings.public.matrix.startClosed)) {
+            layoutContextDispatch({
+              type: ACTIONS.SET_SIDEBAR_NAVIGATION_IS_OPEN,
+              value: true,
+            });
+            layoutContextDispatch({
+              type: ACTIONS.SET_SIDEBAR_CONTENT_IS_OPEN,
+              value: true,
+            });
+            layoutContextDispatch({
+              type: ACTIONS.SET_SIDEBAR_CONTENT_PANEL,
+              value: PANELS.MATRIX,
+            });
           } else {
             layoutContextDispatch({
               type: ACTIONS.SET_SIDEBAR_NAVIGATION_IS_OPEN,