fixup! MB 63: Customize some about pages for Mullvad Browser

Restore Mullvad Browser's custom telemetry page.

docshell/base/nsAboutRedirector.cpp

@@ -191,6 +191,8 @@ static const RedirEntry kRedirMap[] = {
 #    endif
          nsIAboutModule::ALLOW_SCRIPT},
 #  endif
+#endif
+#ifdef MULLVAD_BROWSER
     {"telemetry", "chrome://global/content/aboutTelemetry.xhtml",
      nsIAboutModule::ALLOW_SCRIPT | nsIAboutModule::IS_SECURE_CHROME_UI},
 #endif

docshell/build/components.conf

@@ -31,13 +31,12 @@ about_pages = [
     'srcdoc',
     'support',
     'translations',
+    'telemetry',
     # Removed 'url-classifier'. tor-browser#42831.
 ]
 
 if defined('MOZ_CRASHREPORTER'):
     about_pages.append('crashes')
-if defined('MOZ_TELEMETRY_REPORTING'):
-    about_pages.append('telemetry')
 if defined('MOZ_WEBRTC'):
     about_pages.append('webrtc')
 if buildconfig.substs['MOZ_WIDGET_TOOLKIT'] != 'android':