gRPC URL bar spacing in Designer (#2859)

packages/insomnia-app/app/ui/css/components/request-pane.less

@@ -1,6 +1,13 @@
 .request-pane {
+  height: 100%;
+  grid-template-rows: var(--line-height-md) minmax(0, 1fr) !important;
+
   .request-pane__shortcuts-table {
     color: var(--hl-xl);
     text-align: left;
   }
+
+  .form-control {
+    margin-top: var(--padding-xxs);
+  }
 }