fix(btop): enable rocmSupport for AMD GPU monitoring

Fixes btop not displaying GPU information by compiling it with rocm support enabled.

apps/btop/default.nix

@@ -1,6 +1,8 @@
+{ pkgs, ... }:
 {
   programs.btop = {
     enable = true;
+    package = pkgs.btop.override { rocmSupport = true; };
     settings = {
       vim_keys = true;
       color_theme = "TTY";