feat!: remove features related to the old thread page view

The old thread page view has been unusable for some time since the
introduction of nested replies in threads (since the old view doesn't
display them).

This CL removes all features related to that view:

- Block draft messages from being saved in Google servers.
- Activate the enableLoadingDraftMessages Community Console flag.
- Show the old thread page in the Community Console.

Fixed: twpowertools:124
Change-Id: I7fb815b7e1bf536a15a7bf76bcb2c1f3accdb648
diff --git a/src/contentScripts/communityConsole/start.js b/src/contentScripts/communityConsole/start.js
index 063f58a..cc54540 100644
--- a/src/contentScripts/communityConsole/start.js
+++ b/src/contentScripts/communityConsole/start.js
@@ -2,15 +2,11 @@
 import {getOptions} from '../../common/optionsUtils.js';
 
 import FlattenThreadsReplyActionHandler from './flattenThreads/replyActionHandler.js';
-import ThreadPageDesignWarning from './threadPageDesignWarning.js';
 import WorkflowsImport from './workflows/import.js';
 
-const SMEI_RCE_THREAD_INTEROP = 22;
-
 getOptions(null).then(options => {
   /* IMPORTANT NOTE: Remember to change this when changing the "ifs" below!! */
-  if (options.loaddrafts || options.interopthreadpage ||
-      options.fixpekb269560789) {
+  if (options.fixpekb269560789) {
     var startup =
         JSON.parse(document.querySelector('html').getAttribute('data-startup'));
 
@@ -20,31 +16,12 @@
       }
     }
 
-    if (options.loaddrafts) {
-      startup[4][13] = true;
-    }
-
-    if (options.interopthreadpage) {
-      var index = startup[1][6].indexOf(SMEI_RCE_THREAD_INTEROP);
-
-      switch (options.interopthreadpage_mode) {
-        case 'previous':
-          if (index > -1) startup[1][6].splice(index, 1);
-          break;
-
-        case 'next':
-          if (index == -1) startup[1][6].push(SMEI_RCE_THREAD_INTEROP);
-          break;
-      }
-    }
-
     document.querySelector('html').setAttribute(
         'data-startup', JSON.stringify(startup));
   }
 
   // Initialized here instead of in main.js so the first event is received if it
   // happens when the page loads.
-  window.TWPTThreadPageDesignWarning = new ThreadPageDesignWarning();
   window.TWPTWorkflowsImport = new WorkflowsImport();
 
   if (options.ccdarktheme) {