feat(errors): fix error handling for connection and conference

react/features/base/conference/reducer.js

  * reduction of the specified action.
  */
 function _conferenceFailed(state, { conference, error }) {
-    // The active conference or the one we are joining.
+    // The current (similar to getCurrentConference in
+    // base/conference/functions.js) conference which is joining or joined:
     const conference_ = state.conference || state.joining;
 
     if (conference_ && conference_ !== conference) {

react/features/base/connection/reducer.js

             error: Object | string
         }) {
 
-    // The active or in-progress connection.
-    const connection_ = state.connecting || state.connection;
+    // The current (similar to getCurrentConference in
+    // base/conference/functions.js) connection which is connecting or
+    // connected:
+    const connection_ = state.connection || state.connecting;
 
     if (connection_ && connection_ !== connection) {
         return state;