Bug 1659859, make sure printing from context menu uses correct pref value r=mstriemer

Differential Revision: https://phabricator.services.mozilla.com/D87778

browser/base/content/browser.js

@@ -2701,7 +2701,7 @@ function HandleAppCommandEvent(evt) {
       BrowserOpenFileWindow();
       break;
     case "Print":
-      PrintUtils.printWindow(gBrowser.selectedBrowser.browsingContext);
+      PrintUtils.startPrintWindow(gBrowser.selectedBrowser.browsingContext);
       break;
     case "Save":
       saveBrowser(gBrowser.selectedBrowser);

browser/components/extensions/parent/ext-tabs.js

@@ -1256,7 +1256,7 @@ this.tabs = class extends ExtensionAPI {
         print() {
           let activeTab = getTabOrActive(null);
           let { PrintUtils } = activeTab.ownerGlobal;
-          PrintUtils.printWindow(activeTab.linkedBrowser.browsingContext);
+          PrintUtils.startPrintWindow(activeTab.linkedBrowser.browsingContext);
         },
 
         printPreview() {