Sends analytics event everytime speaker stats is open.

modules/keyboardshortcut/keyboardshortcut.js

     KeyboardShortcut._addShortcutToHelp("SPACE","keyboardShortcuts.pushToTalk");
 
     KeyboardShortcut.registerShortcut("T", null, () => {
+        JitsiMeetJS.analytics.sendEvent("shortcut.speakerStats.clicked");
         APP.store.dispatch(toggleDialog(SpeakerStats, {
             conference: APP.conference
         }));