Remove pointer-event:none from selection-action-box

In change 322816 this was introduced to avoid the box from
interfering with the selection, but apparently clicking on the tooltip
is a feature for creating comments, which I was not aware.

Google-Bug-Id: b/205673569
Change-Id: I65ac3050e793e09be8bea9ac9563556befadd570
diff --git a/polygerrit-ui/app/elements/diff/gr-selection-action-box/gr-selection-action-box_html.ts b/polygerrit-ui/app/elements/diff/gr-selection-action-box/gr-selection-action-box_html.ts
index 558742a..24d63b3 100644
--- a/polygerrit-ui/app/elements/diff/gr-selection-action-box/gr-selection-action-box_html.ts
+++ b/polygerrit-ui/app/elements/diff/gr-selection-action-box/gr-selection-action-box_html.ts
@@ -23,9 +23,6 @@
       font-family: var(--font-family);
       position: absolute;
       white-space: nowrap;
-      /* This prevents the mouse over the tooltip from interfering with the
-         selection. */
-      pointer-events: none;
     }
   </style>
   <gr-tooltip