fix: remove unnecessary will-change

fixes #12890

Author: KaelWD

packages/vuetify/src/components/VAppBar/VAppBar.sass

@@ -25,9 +25,6 @@
     transition: $app-bar-transition
 
 .v-app-bar.v-toolbar--prominent.v-app-bar--shrink-on-scroll
-  .v-toolbar__content
-    will-change: height
-
   .v-toolbar__image
     will-change: opacity
 

packages/vuetify/src/components/VBtn/VBtn.sass

@@ -75,9 +75,6 @@
     top: 0
     transition: $btn-transition
 
-  &:not(.v-btn--disabled)
-    will-change: box-shadow
-
   &:not(.v-btn--round)
     @each $name, $size in $btn-sizes
       &.v-size--#{$name}

packages/vuetify/src/components/VMenu/VMenu.sass

@@ -13,9 +13,6 @@
     overflow-y: auto
     overflow-x: hidden
     contain: content
-    // This is required for an issue on Chrome 65
-    // that prevents scrolling after a menu is opened
-    will-change: transform
     +elevation($menu-content-elevation)
     +radius($menu-content-border-radius)
 

packages/vuetify/src/components/VNavigationDrawer/VNavigationDrawer.sass

@@ -23,7 +23,6 @@
   top: 0
   transition-duration: 0.2s
   transition-timing-function: map-get($transition, 'fast-out-slow-in')
-  will-change: transform
   transition-property: transform, visibility, width
   +bootable()
 

packages/vuetify/src/styles/tools/_elevation.sass

@@ -3,4 +3,3 @@
 
 @mixin elevationTransition($duration: 280ms, $easing: cubic-bezier(0.4, 0, 0.2, 1))
   transition: box-shadow $duration $easing
-  will-change: box-shadow