Revert "fix(isolated_declarations): Always emit module declarations (#…

…4911)" (#4916)

This reverts commit 0fb0b71.

test failed  https://github.com/oxc-project/oxc/actions/runs/10405198969/job/28815418191

We should only emit for
```ts
declare module "xx" {}
declare global {}
```

Do not emit for
```ts
module x {}
declare module x {}
```

@MichaelMitchell-at cc

crates/oxc_isolated_declarations/src/lib.rs

@@ -314,9 +314,6 @@ impl<'a> IsolatedDeclarations<'a> {
                         new_ast_stmts.push(Statement::ImportDeclaration(decl));
                     }
                 }
-                Statement::TSModuleDeclaration(decl) => {
-                    new_ast_stmts.push(Statement::TSModuleDeclaration(decl));
-                }
                 _ => {}
             }
         }