adjust warning code and message

src/compiler/compile/Component.ts

@@ -1226,8 +1226,8 @@ export default class Component {
 									if (variable.module) {
 										should_add_as_dependency = false;
 										component.warn(node as any, {
-											code: 'module-vars-not-reactive',
-											message: `"${name}" is a module variable, it will not be reactive`
+											code: 'module-script-reactive-declaration',
+											message: `"${name}" is declared in a module variable and will not be reactive`
 										});
 									}
 								}

test/validator/samples/reactive-module-variable/warnings.json

@@ -1,7 +1,7 @@
 [
 	{
-		"code": "module-vars-not-reactive",
-		"message": "\"foo\" is a module variable, it will not be reactive",
+		"code": "module-script-reactive-declaration",
+		"message": "\"foo\" is declared in a module variable and will not be reactive",
 		"pos": 67,
 		"start": {
 			"character": 67,