fix: bring back the add meeting URL button

Brings back the button for generating meeting URLs for calendar events.

react/features/base/react/components/native/NavigateSectionListItem.js

 import type { Item } from '../../Types';
 
 import AvatarListItem from './AvatarListItem';
+import Container from './Container';
 import Text from './Text';
 import styles from './styles';
 
         return lines && lines.length ? lines.map(this._renderItemLine) : null;
     }
 
+    /**
+     * Renders the secondary action label.
+     *
+     * @private
+     * @returns {React$Node}
+     */
+    _renderSecondaryAction() {
+        const { secondaryAction } = this.props;
+
+        return (
+            <Container
+                onClick = { secondaryAction }
+                style = { styles.secondaryActionContainer }>
+                <Text style = { styles.secondaryActionLabel }>+</Text>
+            </Container>
+        );
+    }
+
     /**
      * Renders the content of this component.
      *
                 right = { right }>
                 <AvatarListItem
                     item = { item }
-                    onPress = { this.props.onPress } />
+                    onPress = { this.props.onPress } >
+                    { this.props.secondaryAction
+                            && this._renderSecondaryAction() }
+                </AvatarListItem>
             </Swipeout>
         );
     }

react/features/base/react/components/native/styles.js

 import { BoxModel, ColorPalette, createStyleSheet } from '../../../styles';
 
 const OVERLAY_FONT_COLOR = 'rgba(255, 255, 255, 0.6)';
+const SECONDARY_ACTION_BUTTON_SIZE = 30;
 
 export const AVATAR_SIZE = 65;
 export const UNDERLAY_COLOR = 'rgba(255, 255, 255, 0.2)';
         color: OVERLAY_FONT_COLOR
     },
 
+    secondaryActionContainer: {
+        alignItems: 'center',
+        backgroundColor: ColorPalette.blue,
+        borderRadius: 3,
+        height: SECONDARY_ACTION_BUTTON_SIZE,
+        justifyContent: 'center',
+        margin: BoxModel.margin * 0.5,
+        marginRight: BoxModel.margin,
+        width: SECONDARY_ACTION_BUTTON_SIZE
+    },
+
+    secondaryActionLabel: {
+        color: ColorPalette.white
+    },
+
     touchableView: {
         flexDirection: 'row'
     }