settings: Remove unnecessary ancient table styling.

This effectively reverts d96d4e30ab,
which is a bug that hasn't been present for other reasons due to past
design changes.

It fixes a bug where the "Search operators" page had missing margin
between the table and post-table content..

static/styles/settings.css

@@ -151,10 +151,6 @@ h3 .fa-question-circle-o {
     tbody {
         border-bottom: 1px solid hsl(0, 0%, 87%);
     }
-
-    &.table-condensed.table-striped {
-        margin: 0;
-    }
 }
 
 .wrapped-table {
@@ -265,10 +261,6 @@ td .button {
         table-layout: auto;
         border-collapse: separate;
 
-        tbody {
-            border-bottom: none;
-        }
-
         thead th {
             color: inherit;
             background-color: hsl(0, 0%, 100%);