fix(ui5-tabcontainer): fix accessibility of overflow button (#1978)

Author: fifoosid

packages/main/src/TabContainer.hbs

@@ -37,9 +37,9 @@
 				@click="{{_onOverflowButtonClick}}"
 				class="{{classes.overflowButton}}"
 				icon="{{overflowMenuIcon}}"
-				type="Transparent"
-				title="{{overflowMenuTitle}}"
 				design="Transparent"
+				aria-label="{{overflowMenuTitle}}"
+				aria-haspopup="true"
 			></ui5-button>
 		{{/if}}
 	</div>