tighten up spacing for grids in the comments wrapper

opentech/static_src/src/sass/apply/components/_grid.scss

@@ -58,6 +58,16 @@
                 grid-gap: 10px; // sass-lint:disable-line no-misspelled-properties
                 grid-template-columns: 100px 100px;
             }
+
+            .wrapper--comments & {
+                max-width: 600px;
+                margin-bottom: 0;
+                grid-template-columns: 1fr 1fr 1fr;
+            }
+
+            + br {
+                display: none;
+            }
         }
 
         &--proposal-info {