Bug/accessibility 1 (#6774)

* fixing simple name changes

* Fixing button color and tabbing on tabs

* removing some extra lines of code

* Adding some null checks

* Updating as per PR comments

src/sql/workbench/parts/backup/browser/backup.component.ts

@@ -271,6 +271,7 @@ export class BackupComponent {
 
 		// Set backup path list
 		this.pathListBox = new ListBox([], this.contextViewService);
+		this.pathListBox.setAriaLabel(LocalizedStrings.BACKUP_DEVICE);
 		this.pathListBox.onKeyDown(e => {
 			if (this.pathListBox.selectedOptions.length > 0) {
 				const key = e.keyCode;