fix Avatar color-scheme

Author: ilhan007

packages/main/src/Dialog.js

@@ -222,7 +222,7 @@ class Dialog extends Popup {
 	 * @returns {Promise} Resolves when the dialog is open
 	 * @public
 	 */
-	async show(preventInitialFocus) {
+	async show(preventInitialFocus = false) {
 		await super._open(preventInitialFocus);
 	}
 

packages/main/src/themes/Avatar.css

@@ -122,9 +122,9 @@
     height: 100%;
 }
 
-:host(:not([background-color]):not([_has-image])),
-:host([_background-color="Accent6"]),
-:host([background-color="Accent6"]) {
+:host(:not([color-scheme]):not([_has-image])),
+:host([_color-scheme="Accent6"]),
+:host([color-scheme="Accent6"]) {
 	background-color: var(--ui5-avatar-accent6);
 }