refactor(all): color/mode inputs are not longer needed

src/components/datetime/datetime.ts

@@ -421,16 +421,6 @@ export class DateTime extends Ion implements AfterContentInit, ControlValueAcces
    */
   @Input() placeholder: string = '';
 
-  /**
-   * @input {string} The mode determines which platform styles to use.
-   * Possible values are: `"ios"`, `"md"`, or `"wp"`.
-   * For more information, see [Platform Styles](/docs/v2/theming/platform-specific-styles).
-   */
-  @Input()
-  set mode(val: string) {
-    this._setMode(val);
-  }
-
   /**
    * @output {any} Emitted when the datetime selection has changed.
    */