Bug 1966040 - Tab group drag image offset should match that of tabs. r=jswinarton,tabbrowser-reviewers

Differential Revision: https://phabricator.services.mozilla.com/D249046

UltraBlame original commit: 72f763174e2428007c8497ef8d7a75da50650943

Author: marco-c

browser/components/tabbrowser/content/tabs.js

@@ -800,7 +800,6 @@
       let browser = isTab(tab) && tab.linkedBrowser;
       if (isTabGroupLabel(tab)) {
         toDrag = tab;
-        dragImageOffset = -32;
       } else if (gMultiProcessBrowser) {
         var context = canvas.getContext("2d");
         context.fillStyle = "white";