plugins: cleanup most extraConfig args

- Remove `cfg` where it is unused.
- Use `opts` where necessary.

plugins/lsp/language-servers/default.nix

@@ -24,11 +24,9 @@ let
       };
     };
     idris2_lsp = {
-      extraConfig =
-        cfg:
-        mkIf cfg.enable {
-          plugins.idris2.enable = lib.mkDefault true;
-        };
+      extraConfig = {
+        plugins.idris2.enable = lib.mkDefault true;
+      };
     };
     jsonls = {
       settings = cfg: { json = cfg; };
@@ -115,7 +113,7 @@ let
     ts_ls = {
       # NOTE: Provide the plugin default filetypes so that
       # `plugins.lsp.servers.volar.tslsIntegration` doesn't wipe out the default filetypes
-      extraConfig = cfg: {
+      extraConfig = {
         plugins.lsp.servers.ts_ls = {
           filetypes = [
             "javascript"