Loading screen: Ensure bounce animation isn't blocked by main thread (#78469)

remove transform-origin to ensure animation gets put on compositor thread

public/views/index-template.html

@@ -120,26 +120,21 @@
         0% {
           transform: scaleX(1.3) scaleY(0.8);
           animation-timing-function: cubic-bezier(0.3, 0, 0.1, 1);
-          transform-origin: bottom center;
         }
         15% {
           transform: scaleX(0.75) scaleY(1.25);
           animation-timing-function: cubic-bezier(0, 0, 0.7, 0.75);
-          transform-origin: bottom center;
         }
         55% {
           transform: scaleX(1.05) scaleY(0.95);
           animation-timing-function: cubic-bezier(0.9, 0, 1, 1);
-          transform-origin: top center;
         }
         95% {
           transform: scaleX(0.75) scaleY(1.25);
           animation-timing-function: cubic-bezier(0, 0, 0, 1);
-          transform-origin: bottom center;
         }
         100% {
           transform: scaleX(1.3) scaleY(0.8);
-          transform-origin: bottom center;
           animation-timing-function: cubic-bezier(0, 0, 0.7, 1);
         }
       }