Fix gulp baseline-accept (#29301)

* Fix gulp baseline-accept

I think it was ported incorrectly from jake and then never used.

* Re-add read:false to baselineDelete

Author: sandersn

scripts/build/baselineAccept.js

@@ -12,7 +12,7 @@ function baselineAccept(subfolder = "") {
 }
 
 function baselineCopy(subfolder = "") {
-    return gulp.src([`${localBaseline}${subfolder ? `${subfolder}/` : ``}**`, `!${localBaseline}${subfolder}/**/*.delete`], { base: localBaseline, read: false })
+    return gulp.src([`${localBaseline}${subfolder ? `${subfolder}/` : ``}**`, `!${localBaseline}${subfolder}/**/*.delete`], { base: localBaseline })
         .pipe(gulp.dest(refBaseline));
 }
 
@@ -21,4 +21,4 @@ function baselineDelete(subfolder = "") {
         .pipe(rm())
         .pipe(rename({ extname: "" }))
         .pipe(rm(refBaseline));
-}
+}