[bugfix] Toast: mask render uncorrectly when forbidClick (#1154)

packages/vant-css/src/toast.css

@@ -17,6 +17,10 @@
   transform: translate3d(-50%, -50%, 0);
   background-color: rgba(0, 0, 0, .7);
 
+  &--unclickable {
+    pointer-events: none;
+  }
+
   &--text {
     padding: 12px;
     min-width: 220px;