(preferences) Disable private window separation again

Holy shit Mozilla actually listening to feedback?!?!?! Since the option is back, this saves me a fuck ton of work later for a potential 127/128.x.xv.

Author: K4sum1

browser/app/profile/firefox.js

@@ -823,7 +823,7 @@ pref("browser.theme.dark-private-windows", true);
 
 // Pref to control whether or not Private Browsing windows show up
 // as separate icons in the Windows taskbar.
-pref("browser.privateWindowSeparation.enabled", true);
+pref("browser.privateWindowSeparation.enabled", false);
 
 // Controls visibility of the privacy segmentation preferences section.
 pref("browser.privacySegmentation.preferences.show", false);