scratchpad - fix tests on macOS (microsoft#184314)

Author: bpasero

src/vs/workbench/services/workingCopy/test/electron-sandbox/workingCopyBackupTracker.test.ts

@@ -570,7 +570,7 @@ suite('WorkingCopyBackupTracker (native)', function () {
 				return scratchpadHotExitTest.call(this, HotExitConfiguration.ON_EXIT, ShutdownReason.CLOSE, false, true, false);
 			});
 			test('should hot exit (reason: CLOSE, windows: single, empty workspace)', function () {
-				return scratchpadHotExitTest.call(this, HotExitConfiguration.ON_EXIT, ShutdownReason.CLOSE, false, false, false);
+				return scratchpadHotExitTest.call(this, HotExitConfiguration.ON_EXIT, ShutdownReason.CLOSE, false, false, !!isMacintosh);
 			});
 			test('should hot exit (reason: CLOSE, windows: multiple, workspace)', function () {
 				return scratchpadHotExitTest.call(this, HotExitConfiguration.ON_EXIT, ShutdownReason.CLOSE, true, true, false);
@@ -759,8 +759,6 @@ suite('WorkingCopyBackupTracker (native)', function () {
 			assert.strictEqual(veto, shouldVeto);
 
 			await cleanup();
-
-			await cleanup();
 		}
 	});
 });