[Files]: Fix filter chip padding.

Left 12px, right: 8px, as per b:272311823

Bug: b:272311823
Change-Id: I19f24bd9651644d24496a13e22e51ad7669d1bef
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4344390
Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Commit-Queue: Bo Majewski <majewski@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1117930}

ui/file_manager/file_manager/widgets/xf_select.ts

@@ -332,7 +332,7 @@ function getCSS(): CSSResultGroup {
       margin-inline: 4px;
       min-width: auto;
       outline: none;
-      padding: 0px 8px;
+      padding: 0px 8px 0 12px;
       white-space: nowrap;
     }
     .xf-select-icon {