Add splash screen backdrop to login page

src/controllers/itemDetails/index.js

@@ -503,7 +503,7 @@ function renderBackdrop(page, item) {
         // If backdrops are disabled, but the header banner is enabled, add a class to the page to disable the transparency
         page.classList.toggle('noBackdropTransparency', isBannerEnabled && !userSettings.enableBackdrops());
 
-        setBackdrops([item], null, null, isBannerEnabled);
+        setBackdrops([item], null, isBannerEnabled);
     } else {
         clearBackdrop();
     }

src/controllers/session/login/index.html

@@ -1,4 +1,4 @@
-<div id="loginPage" data-role="page" class="page standalonePage" data-backbutton="false">
+<div id="loginPage" data-role="page" class="page standalonePage backdropPage" data-backbutton="false" data-backdroptype="splashscreen">
     <div class="padded-left padded-right padded-bottom-page margin-auto-y">
         <form class="manualLoginForm margin-auto-x hide">
             <div class="padded-left padded-right flex align-items-center justify-content-center">