fix(layout): set external-video/screen share initial states on all layouts

Only smart layout takes screen sharing/external video states in account
when populating its initial state. The others don't, and that causes
some weird issues when switching back-and-forth between layout types due
to their input states becoming inconsistent - ie having an active screen
sharing and transitioning from Smart -> Custom would mark it as false
(due to its absence from the initial state) and pollute its state for
subsequent layouts.

This commit guarantees those features are taken into account when
populating initial input states for Focus On*/Custom layouts.

bigbluebutton-html5/imports/ui/components/layout/layout-manager/customLayout.jsx

@@ -179,6 +179,12 @@ const CustomLayout = (props) => {
           cameraDock: {
             numCameras: cameraDockInput.numCameras,
           },
+          externalVideo: {
+            hasExternalVideo: input.externalVideo.hasExternalVideo,
+          },
+          screenShare: {
+            hasScreenShare: input.screenShare.hasScreenShare,
+          },
         }, INITIAL_INPUT_STATE),
       });
     }

bigbluebutton-html5/imports/ui/components/layout/layout-manager/presentationFocusLayout.jsx

@@ -95,6 +95,12 @@ const PresentationFocusLayout = (props) => {
           cameraDock: {
             numCameras: cameraDockInput.numCameras,
           },
+          externalVideo: {
+            hasExternalVideo: input.externalVideo.hasExternalVideo,
+          },
+          screenShare: {
+            hasScreenShare: input.screenShare.hasScreenShare,
+          },
         }, INITIAL_INPUT_STATE),
       });
     } else {

bigbluebutton-html5/imports/ui/components/layout/layout-manager/videoFocusLayout.jsx

@@ -128,6 +128,12 @@ const VideoFocusLayout = (props) => {
             cameraDock: {
               numCameras: cameraDockInput.numCameras,
             },
+            externalVideo: {
+              hasExternalVideo: input.externalVideo.hasExternalVideo,
+            },
+            screenShare: {
+              hasScreenShare: input.screenShare.hasScreenShare,
+            },
           },
           INITIAL_INPUT_STATE,
         ),