Remove custom Add-ons Manager style used in Ambassador (standalone)

src/chrome/ambassador/extensionsOverlay.css

@@ -1,23 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
-   License, v. 2.0. If a copy of the MPL was not distributed with this
-   file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");
-@namespace html url("http://www.w3.org/1999/xhtml");
-
-#addons-page {
-  padding: 0px;
-}
-
-#header, #main {
-  padding-left: 18px;
-  padding-right: 18px;
-}
-
-#header {
-  padding-top: 18px;
-}
-
-#main {
-  padding-bottom: 18px;
-}