Remove irrelevant override that eliminated strict-local

It seems this change was needed when Text.windows.js was imported at one
point or another, but yarn lint is clean now when reverting the @flow
settings to strict-local.

Ran yarn lint to test.

Resolves microsoft#7149

vnext/src/Libraries/Text/Text.windows.js

@@ -4,8 +4,7 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * #7149 should be strict local
- * @flow
+ * @flow strict-local
  * @format
  */