adjust fullscreen player z-indexes back

- the modal needs to appear above
- instead, move the titlebar controls z-index under the fullscreen players

src/renderer/features/player/components/full-screen-player.module.css

@@ -2,7 +2,7 @@
     position: absolute;
     top: 0;
     left: 0;
-    z-index: 5100;
+    z-index: 200;
     display: flex;
     justify-content: center;
     padding: 2rem;

src/renderer/features/player/components/full-screen-visualizer.module.css

@@ -2,7 +2,7 @@
     position: absolute;
     top: 0;
     left: 0;
-    z-index: 5100;
+    z-index: 200;
     display: flex;
     flex-direction: column;
     width: 100%;