lib: reword warning for --localstorage-file to fix no-regex-spaces lint

Author: danielmbrasil

lib/internal/webstorage.js

@@ -23,7 +23,7 @@ ObjectDefineProperties(module.exports, {
         const location = getOptionValue('--localstorage-file');
 
         if (location === '') {
-          process.emitWarning(`${location} is an invalid localStorage location`);
+          process.emitWarning('`--localstorage-file` was provided without a valid path');
 
           return undefined;
         }

test/parallel/test-webstorage.js

@@ -46,7 +46,7 @@ test('localStorage emits a warning without --localstorage-file ', async () => {
   ]);
   assert.strictEqual(cp.code, 0);
   assert.strictEqual(cp.signal, null);
-  assert.match(cp.stderr, /Warning:  is an invalid localStorage location/);
+  assert.match(cp.stderr, /Warning: `--localstorage-file` was provided without a valid path/);
 });
 
 test('localStorage is not persisted if it is unused', async () => {