Fix: spacer div doesn't need full height

tabby-core/src/components/appRoot.component.pug

@@ -91,7 +91,7 @@ title-bar(
         div.window-controls-spacer(
             *ngIf='config.store.appearance.frame == "thin" \
             && (hostApp.platform == Platform.Windows) \
-            && (config.store.appearance.tabsLocation !== "left" || config.store.appearance.tabsLocation !== "right")',
+            && (config.store.appearance.tabsLocation !== "bottom"',
         )
     .content
         start-page.content-tab.content-tab-active(*ngIf='ready && app.tabs.length == 0')