www/*chromium: revert upstream commit to fix file dialog behaviour

This change reverts the following commit which neuters the Enter
key in the file dialogs by not preselecting the active button by
default because of the following joke:

+ GTK_RESPONSE_ACCEPT as the default button, which should be avoided to prevent
+ an exploit where the user is instructed to hold Enter before the dialog
+// appears.

commit e93121e97478a41d529c8586a48b4ec34173f79a
Author: Tom Anderson <thomasanderson@chromium.org>
Date: Mon Jan 5 17:42:17 2026 -0800

[GTK] Don't preselect file dialog accept buttons

(cherry picked from commit a50101eb4b6190b94c85b7cc0a0745ff44678c16)