Revert "feat(): fix performance by without opacity and cubic-bezier"

This reverts commit c731abe.

Author: rdlabo

projects/scroll-header/assets/scroll-header.directive.css

@@ -48,11 +48,13 @@ ion-content > cdk-virtual-scroll-viewport {
       ion-header {
         position: sticky;
         top: 0;
-        will-change: transform;
+        will-change: transform, opacity;
       }
       &.scroll-header-animated {
         ion-header {
-          transition: transform 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
+          transition:
+            transform 0.4s ease 0s,
+            opacity 0.4s ease 0s;
         }
       }