[ui] remove borders on tables

ui/src/components/widgets/Table.svelte

@@ -274,6 +274,9 @@
     width: 100%;
     table-layout: fixed;
 
+    border-spacing: 0;
+    border-collapse: collapse;
+
     tr {
       &.left-active {
         background: linear-gradient(
@@ -314,8 +317,6 @@
       line-height: 1em;
       line-break: anywhere;
 
-      border: transparent;
-
       &.attr-action {
         max-width: 1em;
       }