[NTP::PhysicalWeb] Do not show "More" button.

The PRD has been changed, so now we should not show the "More" button
in the Physical Web section.

BUG=674897

Review-Url: https://codereview.chromium.org/2590143002
Cr-Commit-Position: refs/heads/master@{#439761}

components/ntp_snippets/physical_web_pages/physical_web_page_suggestions_provider.cc

@@ -77,7 +77,7 @@ CategoryInfo PhysicalWebPageSuggestionsProvider::GetCategoryInfo(
   return CategoryInfo(
       base::ASCIIToUTF16("Physical web pages"),
       ContentSuggestionsCardLayout::FULL_CARD,
-      /*has_more_action=*/true,
+      /*has_more_action=*/false,
       /*has_reload_action=*/false,
       /*has_view_all_action=*/false,
       /*show_if_empty=*/false,