[Tabs Runner] Only list tabs from "normal" windows

Browser app windows are generally presented to the user seperate from the
browser and would show up in e.g. the windows runner already.

extension/extension-tabsrunner.js

@@ -53,7 +53,9 @@ var whitelistedTabProperties = [
 addCallback("tabsrunner", "getTabs", function (message) {
     ++runningGetTabsQueries;
 
-    chrome.tabs.query({}, function (tabs) {
+    chrome.tabs.query({
+        windowType: "normal"
+    }, (tabs) => {
         if (clearFavIconDataTimeoutId) {
             clearTimeout(clearFavIconDataTimeoutId);
             clearFavIconDataTimeoutId = 0;