Create unencrypted rooms by default in e2e-tests

Otherwise the lazy loading test will try to join the room after the encrypted messages have already been sent, making them invisible. 

See https://github.com/vector-im/riot-web/issues/13226#issuecomment-614928362

src/components/views/dialogs/CreateRoomDialog.js

@@ -194,7 +194,12 @@ export default createReactClass({
         let e2eeSection;
         if (!this.state.isPublic && SettingsStore.getValue("feature_cross_signing")) {
             e2eeSection = <React.Fragment>
-                <LabelledToggleSwitch label={ _t("Enable end-to-end encryption")} onChange={this.onEncryptedChange} value={this.state.isEncrypted} />
+                <LabelledToggleSwitch
+                    label={ _t("Enable end-to-end encryption")}
+                    onChange={this.onEncryptedChange}
+                    value={this.state.isEncrypted}
+                    className='mx_CreateRoomDialog_e2eSwitch' // for end-to-end tests
+                />
                 <p>{ _t("You can’t disable this later. Bridges & most bots won’t work yet.") }</p>
             </React.Fragment>;
         }