Remove unused inner class name

Author: tcbegley

src/components/popover/Popover.js

@@ -193,11 +193,6 @@ Popover.propTypes = {
    */
   class_name: PropTypes.string,
 
-  /**
-   * CSS class to apply to the Popover.
-   */
-  inner_class_name: PropTypes.string,
-
   /**
    * Used to allow user interactions to be persisted when the page is refreshed.
    * See https://dash.plotly.com/persistence for more details
@@ -238,13 +233,6 @@ Popover.propTypes = {
    */
   className: PropTypes.string,
 
-  /**
-   * **DEPRECATED** Use `inner_class_name` instead.
-   *
-   * CSS class to apply to the Popover.
-   */
-  innerClassName: PropTypes.string,
-
   /**
    * Dash-assigned callback that gets fired when the value changes.
    */