ref(toolbar): remove custom (old) InviteButton dropdown config

css/_filmstrip.scss

         &#filmstripLocalVideo {
             align-self: flex-end;
             display: block;
-
-            /**
-             * The invite button style.
-             */
-            .filmstrip__invite {
-                padding-bottom: 5px;
-                margin-left: 2px;
-            }
-
-            /**
-             * The invite button group style.
-             * TOFIX: use AtlasKit.ButtonGroup if it starts supporting different
-             * flex grow options for the buttons.
-             */
-            .invite-button-group {
-                display: inline-flex;
-                justify-content: space-between;
-                width: 100%;
-
-                & button {
-                    flex-grow: 1;
-                    flex-shrink: 1;
-                    overflow: hidden;
-                }
-
-                & > * {
-                    flex-grow: 0;
-                    flex-shrink: 0;
-                    margin-left: 2px;
-                }
-            }
         }
 
         &.hidden {

css/_vertical_filmstrip_overrides.scss

         }
 
         /**
-         * Re-styles the local Video and invite button to better fit the
-         * vertical filmstrip layout.
+         * Re-styles the local Video to better fit vertical filmstrip layout.
          */
         #filmstripLocalVideo {
             align-self: initial;
             flex-direction: column-reverse;
             height: auto;
             justify-content: flex-start;
-
-            .filmstrip__invite {
-                padding-bottom: 0px;
-                padding-top: 5px;
-                z-index: $dropdownZ;
-            }
         }
 
         /**

interface_config.js

     ],
 
     SETTINGS_SECTIONS: [ 'language', 'devices', 'moderator' ],
-    INVITE_OPTIONS: [ 'invite', 'dialout', 'addtocall' ],
 
     // Determines how the video would fit the screen. 'both' would fit the whole
     // screen, 'height' would fit the original video height to the height of the

react/features/invite/functions.js

     return doGetJSON(url);
 }
 
-/**
- * Get the position of the invite option in the interfaceConfig.INVITE_OPTIONS
- * list.
- *
- * @param {string} name - The invite option name.
- * @private
- * @returns {number} - The position of the option in the list.
- */
-export function getInviteOptionPosition(name: string): number {
-    return interfaceConfig.INVITE_OPTIONS.indexOf(name);
-}
-
 /**
  * Sends a post request to an invite service.
  *
     });
 }
 
-/**
- * Indicates if an invite option is enabled in the configuration.
- *
- * @param {string} name - The name of the option defined in
- * interfaceConfig.INVITE_OPTIONS.
- * @returns {boolean} - True to indicate that the given invite option is
- * enabled, false - otherwise.
- */
-export function isInviteOptionEnabled(name: string) {
-    return getInviteOptionPosition(name) !== -1;
-}
-
 /**
  * Sends an ajax request to a directory service.
  *