[cr138][Android] New isEnabled arg at AddExceptionPreference.ctor

Chromium change:
https://source.chromium.org/chromium/chromium/src/+/20d50a1ce5cb2a033ceac9279d429e6dfed87534

	Disable "Add Exception" button if content-setting is managed

	BUG=399933929

	Change-Id: I6e854d3ea379efc5275d01e20f6b2637ae26809e
	Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6520460

components/browser_ui/site_settings/android/java/src/org/chromium/components/browser_ui/site_settings/BraveSingleCategorySettings.java

@@ -56,12 +56,14 @@ public class BraveSingleCategorySettings extends BaseSiteSettingsFragment
             exception = true;
         }
         if (exception) {
+            boolean enableAddExceptionButton = !mCategory.isManaged();
             getPreferenceScreen()
                     .addPreference(
                             new AddExceptionPreference(
                                     getPreferenceManager().getContext(),
                                     ADD_EXCEPTION_KEY,
                                     getString(getAddExceptionDialogMessageResourceId()),
+                                    enableAddExceptionButton,
                                     mCategory,
                                     this));
         }