Delete unused #item-preview styles from items#show page

Oops, left these lying around after replacing the UI with the 2020 one!

app/assets/stylesheets/items/_show.sass

@@ -1,15 +1,6 @@
 @import "../partials/clean/constants"
 @import "../partials/clean/mixins"
 
-=grayscale
-  // http://www.karlhorky.com/2012/06/cross-browser-image-grayscale-with-css.html
-  filter: url("data:image/svg+xml;utf8,<svg xmlns=\'http://www.w3.org/2000/svg\'><filter id=\'grayscale\'><feColorMatrix type=\'matrix\' values=\'0.3333 0.3333 0.3333 0 0 0.3333 0.3333 0.3333 0 0 0.3333 0.3333 0.3333 0 0 0 0 0 1 0\'/></filter></svg>#grayscale")
-  filter: gray
-  
-  // Cheap hack: https://github.com/chriseppstein/compass/issues/811
-  $percent: 100%
-  -webkit-filter: unquote('grayscale(#{$percent})')
-
 body.items-show
   #item-header
     border-bottom: 1px solid $module-border-color
@@ -36,46 +27,6 @@ body.items-show
   #item-name
     margin-bottom: 0
     
-  #item-preview
-    +clearfix
-    
-    > div, > ul
-      float: left
-      
-  #item-preview-species
-    display: block
-    width: 400px
-    
-    .pet-type, img
-      height: 50px
-      width: 50px
-      
-    .pet-type
-      +inline-block
-      &.current
-        background: $module-bg-color
-        outline: 1px solid $module-border-color
-      &.deactivated
-        img
-          +grayscale
-          +opacity(0.5)
-        &.current
-          background: transparent
-          outline-color: $error_border_color
-
-    ul, li
-      display: inline
-
-  #item-preview-error
-    display: none
-    padding: 20px 10px 0
-    width: 380px
-    
-  #item-preview-swf
-    height: 300px
-    overflow: hidden
-    width: 300px
-    
   #item-zones
     font:
       family: $text-font
@@ -149,15 +100,6 @@ body.items-show
       li:last-child::after
         content: "."
     
-  #item-preview-header
-    clear: both
-    
-    h3, a
-      +inline-block
-    a
-      font-size: 85%
-      margin: -1.5em 0 0 1em
-    
   .nc-icon
     height: 16px
     width: 16px