LazyLoad: Enable the lazy load enabled setting by default

This setting is used to disable lazyload from renderer for offline
pages usecase. It will be further used to disable lazyload on reload
navigations, etc. This CL just makes the setting to ON by default.

TBR: dcheng@chromium.org
Change-Id: Ie5a4bbf6e54ea00846bf8e5ec63008cc1b658b37
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1719973
Commit-Queue: rajendrant <rajendrant@chromium.org>
Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#681494}

third_party/blink/renderer/core/frame/settings.json5

@@ -964,7 +964,7 @@
 
     {
       name: "lazyLoadEnabled",
-      initial: false,
+      initial: true,
     },
     //
     // Lazy frame loading distance-from-viewport thresholds for different effective connection types.