Fix missing blur on feedback panel shadow

Bug: 989635
Change-Id: Ife7bc12d404256420c4c2af3810a9f10077dc259
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1896485Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Commit-Queue: Alex Danilo <adanilo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712042}

ui/file_manager/file_manager/foreground/elements/xf_display_panel.js

@@ -70,9 +70,8 @@ class DisplayPanel extends HTMLElement {
               #container {
                   align-items: stretch;
                   background-color: #FFF;
-                  box-shadow: -1px -1px rgba(60, 64, 67, 0.15),
-                              0px 2px rgba(60, 64, 67, 0.3),
-                              2px 0px rgba(60, 64, 67, 0.15);
+                  box-shadow: 0px 1px 2px 0px rgba(60, 64, 67, 0.3),
+                              1px 1px 3px 1px rgba(60, 64, 67, 0.15);
                   border-radius: 4px;
                   display: flex;
                   flex-direction: column;