[NTP] Hide 'Customize' button for only very short windows.

Previously, the 'Customize' button was hidden for windows that are
shorter than the new customization dialog. Seems like this is too
aggressive. Only hide 'Customize' button to now overlap with OGB.

Bug: 981847, 972976, 972962, 972480, 959097
Change-Id: Ia335400c2ac8f77d8ffb645ebb82fee2e3f61c8e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1692876Reviewed-by: Kristi Park <kristipark@chromium.org>
Commit-Queue: Gayane Petrosyan <gayane@chromium.org>
Cr-Commit-Position: refs/heads/master@{#675799}

chrome/browser/resources/local_ntp/customize.css

@@ -116,10 +116,7 @@ html[dir=rtl] #edit-bg {
   }
 }
 
-/* If window height is less then the customization menu height, then hide the
- * 'customize' button.
- */
-@media (max-height: 528px) {
+@media (max-height: 100px) {
   #edit-bg {
     display: none;
   }