fix(e2ee) fix showing not supported warning when alone

react/features/e2ee/components/E2EESection.js

 import { Switch } from '../../base/react';
 import { connect } from '../../base/redux';
 import { toggleE2EE } from '../actions';
-
+import { doesEveryoneSupportE2EE } from '../functions';
 
 type Props = {
 
     /**
      * True if the switch is toggled on.
      */
-    enabled: boolean,
-
-    /**
-     * True if the section description should be expanded, false otherwise.
-     */
-    expand: boolean
+    enabled: boolean
 };
 
 /**
  * @returns {Props}
  */
 function mapStateToProps(state) {
-    const { enabled, everyoneSupportE2EE } = state['features/e2ee'];
+    const { enabled } = state['features/e2ee'];
 
     return {
         _enabled: enabled,
-        _everyoneSupportE2EE: everyoneSupportE2EE
+        _everyoneSupportE2EE: doesEveryoneSupportE2EE(state)
     };
 }
 

react/features/e2ee/functions.js

+
+import { getParticipantCount } from '../base/participants/functions';
+import { toState } from '../base/redux';
+
+/**
+ * Gets the value of a specific React {@code Component} prop of the currently
+ * mounted {@link App}.
+ *
+ * @param {Function|Object} stateful - The redux store or {@code getState}
+ * function.
+ * @param {string} propName - The name of the React {@code Component} prop of
+ * the currently mounted {@code App} to get.
+ * @returns {*} The value of the specified React {@code Component} prop of the
+ * currently mounted {@code App}.
+ */
+export function doesEveryoneSupportE2EE(stateful) {
+    const state = toState(stateful);
+    const { everyoneSupportE2EE } = state['features/e2ee'];
+    const { e2eeSupported } = state['features/base/conference'];
+    const participantCount = getParticipantCount(state);
+
+    if (typeof everyoneSupportE2EE === 'undefined' && participantCount === 1) {
+        // This will happen if we are alone.
+
+        return e2eeSupported;
+    }
+
+    return everyoneSupportE2EE;
+}