fix(eslint): Add no-extra-bind rule

.eslintrc.js

         'no-eq-null': 2,
         'no-eval': 2,
         'no-extend-native': 2,
+        'no-extra-bind': 2,
         'no-extra-label': 2,
         'no-fallthrough': 2,
         'no-floating-decimal': 2,

JitsiConnection.js

             // sends analytics and callstats event
             Statistics.sendEventToAll('connection.failed.' + errType,
                 {label: msg});
-        }.bind(this));
+        });
 
     this.addEventListener(JitsiConnectionEvents.CONNECTION_DISCONNECTED,
         function(msg) {

JitsiMeetJS.js

                     = window.performance.now();
 
                 return Promise.reject(error);
-            }.bind(this));
+            });
     },
     /**
      * Checks if its possible to enumerate available cameras/micropones.

modules/xmpp/ChatRoom.js

         }.bind(this), function(error) {
             GlobalOnErrorHandler.callErrorHandler(error);
             logger.error('Error getting room info: ', error);
-        }.bind(this));
+        });
     }
 
 

modules/xmpp/JingleSessionPC.js

             if (failureCb) {
                 failureCb(error);
             }
-        }.bind(this);
+        };
     }
 
     static onJingleFatalError(session, error) {

modules/xmpp/moderator.js

             logger.info('Log out OK, url: ' + logoutUrl, result);
             Settings.clearSessionId();
             callback(logoutUrl);
-        }.bind(this),
+        },
         function(error) {
             const errmsg = 'Logout error';
             GlobalOnErrorHandler.callErrorHandler(new Error(errmsg));