wrappers: fix _module.check disablement

When passing a string to `disabledModules`, it is appended to
`modulesPath`. To avoid this, explicitly pass a `{key}` module.

Adds an assertion module to the platform-wrapper integration tests:

    Failed assertions:
       - Expected programs.nixvim._module.check to be true. Definitions:
       - In `/nix/store/XXXX-source/flake/wrappers.nix': false

Co-authored-by: MrQubo <jakub.jakub.nowak@gmail.com>

flake/wrappers.nix

@@ -19,6 +19,7 @@ let
   configuration = self.lib.evalNixvim {
     modules = [
       {
+        _file = __curPos.file;
         key = "<internal:nixvim-nocheck-base-eval>";
         config._module.check = false;
       }

tests/platforms/darwin.nix

@@ -9,6 +9,9 @@ self.inputs.nix-darwin.lib.darwinSystem {
 
       programs.nixvim = {
         enable = true;
+        imports = [
+          ./module-check-enabled.nix
+        ];
       };
 
       system.stateVersion = 5;

tests/platforms/hm.nix

@@ -14,6 +14,9 @@ self.inputs.home-manager.lib.homeManagerConfiguration {
 
       programs.nixvim = {
         enable = true;
+        imports = [
+          ./module-check-enabled.nix
+        ];
       };
 
       programs.home-manager.enable = true;

tests/platforms/module-check-enabled.nix

@@ -0,0 +1,14 @@
+{
+  lib,
+  config,
+  options,
+  ...
+}:
+{
+  assertions = [
+    {
+      assertion = config._module.check;
+      message = "Expected ${options._module.check} to be true. Definitions:${lib.options.showDefs options._module.check.definitionsWithLocations}";
+    }
+  ];
+}

tests/platforms/nixos.nix

@@ -16,6 +16,9 @@ self.inputs.nixpkgs.lib.nixosSystem {
 
       programs.nixvim = {
         enable = true;
+        imports = [
+          ./module-check-enabled.nix
+        ];
       };
     }
     self.nixosModules.nixvim

wrappers/_shared.nix

@@ -52,7 +52,7 @@ let
   baseConfiguration = extendModules {
     modules = [
       nixpkgsModule
-      { disabledModules = [ "<internal:nixvim-nocheck-base-eval>" ]; }
+      { disabledModules = [ { key = "<internal:nixvim-nocheck-base-eval>"; } ]; }
     ];
   };