fix: remove unnecessary async/await from _onkeydown methods

Fixes TypeScript linter errors for awaiting non-Promise parent calls

Author: kgogov

packages/main/src/ListItemCustom.ts

@@ -56,15 +56,15 @@ class ListItemCustom extends ListItem {
 	@property()
 	declare accessibleName?: string;
 
-	async _onkeydown(e: KeyboardEvent) {
+	_onkeydown(e: KeyboardEvent) {
 		const isTab = isTabNext(e) || isTabPrevious(e);
 		const isFocused = this.matches(":focus");
 
 		if (!isTab && !isFocused && !isF2(e) && !isF7(e)) {
 			return;
 		}
 
-		await super._onkeydown(e);
+		super._onkeydown(e);
 	}
 
 	_onkeyup(e: KeyboardEvent) {

packages/main/src/TreeItemBase.ts

@@ -313,8 +313,8 @@ class TreeItemBase extends ListItem {
 		this.fireDecoratorEvent("toggle", { item: this });
 	}
 
-	async _onkeydown(e: KeyboardEvent) {
-		await super._onkeydown(e);
+	_onkeydown(e: KeyboardEvent) {
+		super._onkeydown(e);
 
 		if (!this._fixed && this.showToggleButton && isRight(e)) {
 			if (!this.expanded) {