fix(toast): error progress bar lost visibility

The toast error progress bar is not visibile because the build
process omitted to compile for error variation of toast progress
and ended up showing the same color as error background of toast
which makes the progress bar not visible.

src/definitions/modules/toast.less

@@ -110,7 +110,7 @@
       &.success .bar.bar.bar {
         background: @toastSuccessProgressColor;
       }
-      .error .bar.bar.bar {
+      &.error .bar.bar.bar {
         background: @toastErrorProgressColor;
       }
       &.neutral .bar.bar.bar {