Increase topbar z-index number (#4028)

Signed-off-by: Alex Andreev <alex.andreev.email@gmail.com>

src/renderer/components/layout/topbar.module.css

@@ -25,7 +25,7 @@
   grid-template-rows: var(--main-layout-header);
   grid-template-areas: "title controls";
   background-color: var(--layoutBackground);
-  z-index: 1;
+  z-index: 2;
   width: 100%;
   grid-area: topbar;
 }