[fsp] Polish icons in Files app.

ui/file_manager/file_manager/foreground/css/file_types.css

Index: ui/file_manager/file_manager/foreground/css/file_types.css
diff --git a/ui/file_manager/file_manager/foreground/css/file_types.css b/ui/file_manager/file_manager/foreground/css/file_types.css
index b2461c07d4ce81a62a96d4f2ca6bdfdf1b6b71de..97f790e11293744fef3e713d60d1fb91ff62c4d1 100644
--- a/ui/file_manager/file_manager/foreground/css/file_types.css
+++ b/ui/file_manager/file_manager/foreground/css/file_types.css
@@ -511,5 +511,5 @@ tree:focus .tree-item[selected] > .tree-row >
 
 list:focus li[selected] [volume-type-icon='provided'],
 tree:focus .tree-item[selected] > .tree-row > [volume-type-icon='provided']{
-  -webkit-filter: invert(100%) grayscale(100%) brightness(200%);
+  -webkit-filter: contrast(0) brightness(200%);
 }