Fix duplicating "enable_transience" for fish

Starship enables fish transience automatically if it's transience is
enabled, duplicated call was causing errors

Remove obsolete fish.nix

system/home/plasma/konsole.nix

@@ -13,7 +13,7 @@
     profiles.onelight = {
       name = "One-Light";
       colorScheme = "onelight";
-      command = "${config.programs.fish}/bin/fish";
+      command = "${config.programs.fish.package}/bin/fish";
       font = {
         name = fonts.monospace.name;
         size = fonts.sizes.terminal;

system/home/shell/fish.nix

@@ -1,7 +0,0 @@
-{ ... }:
-{
-  programs.fish = {
-    enable = true;
-    interactiveShellInit = "enable_transience";
-  };
-}

system/home/shell/starship.nix

@@ -1,6 +1,5 @@
 { ... }:
 {
-  programs.fish.interactiveShellInit = "enable_transience";
   programs.starship = {
     enable = true;
     enableTransience = true;