Fix double shadow for tables in dashboard modules

jet/static/jet/css/_changelist.scss

@@ -20,6 +20,7 @@
 
   table {
     @extend .table;
+    box-shadow: 0 2px 0 0 $content-border2-color;
     width: 100%;
   }
 
@@ -59,5 +60,6 @@
 
 table#change-history {
   @extend .table;
+  box-shadow: 0 2px 0 0 $content-border2-color;
   width: 100%;
 }

jet/static/jet/css/_table.scss

@@ -4,7 +4,6 @@
   background: $content-background-color;
   border-collapse: collapse;
   border-radius: 4px;
-  box-shadow: 0 2px 0 0 $content-border2-color;
   margin-bottom: 2px;
   overflow-x: auto;
   width: 100%;