chore(validation): remove unneeded path arg (#5628)

remove `rootDir` from the validation of `normalizePath` for `dist-custom-elements`.
we expect that users will be able to select their own directory for typings, even
if they appear outside of the `rootDir`. this change aligns this output target
with the rest of the output target checks in this file.

src/compiler/types/validate-primary-package-output-target.ts

@@ -50,7 +50,7 @@ export const PRIMARY_PACKAGE_TARGET_CONFIGS = {
       normalizePath(relative(rootDir, join(outputTargetDir, 'index.js'))),
     getTypesPath: (rootDir: string, outputTargetConfig: d.OutputTargetDistCustomElements) => {
       return outputTargetConfig.generateTypeDeclarations
-        ? normalizePath(relative(rootDir, join(rootDir, outputTargetConfig.dir!, 'index.d.ts')))
+        ? normalizePath(relative(rootDir, join(outputTargetConfig.dir!, 'index.d.ts')))
         : null;
     },
   },