Bug 1765076 - Use in-content styles for page setup dialog. r=mstriemer

These look much nicer, and support dark mode.

Depends on D143903

Differential Revision: https://phabricator.services.mozilla.com/D143904

toolkit/components/printing/content/printPageSetup.xhtml

@@ -5,6 +5,7 @@
    - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
 
 <?xml-stylesheet href="chrome://global/skin/global.css" type="text/css"?>
+<?xml-stylesheet href="chrome://global/skin/in-content/common.css"?>
 <?xml-stylesheet href="chrome://global/skin/printPageSetup.css" type="text/css"?>
 
 <window xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
@@ -12,6 +13,7 @@
   onload="onLoad();"
   oncancel="return onCancel();"
   data-l10n-id="print-setup"
+  dialogroot="true"
   persist="screenX screenY"
   screenX="24" screenY="24">
 <dialog id="printPageSetupDialog">

toolkit/themes/windows/global/printPageSetup.css

@@ -12,11 +12,11 @@ fieldset {
   margin: 3px 3px 6px;
 }
 
-.portrait-page {
+.portrait-page .radio-icon {
   list-style-image: url("chrome://global/skin/icons/Portrait.png");
 }
 
-.landscape-page {
+.landscape-page .radio-icon {
   list-style-image: url("chrome://global/skin/icons/Landscape.png");
 }