Minor cleanup

app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsBrowseController.kt

@@ -58,8 +58,8 @@ class SettingsBrowseController : SettingsController() {
                 if (context.isAuthenticationSupported() && activity != null) {
                     requireAuthentication(
                         activity as? FragmentActivity,
-                        activity!!.getString(R.string.pref_category_nsfw_content),
-                        activity!!.getString(R.string.confirm_lock_change),
+                        context.getString(R.string.pref_category_nsfw_content),
+                        context.getString(R.string.confirm_lock_change),
                     )
                 }
             }

app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsSecurityController.kt

@@ -31,8 +31,8 @@ class SettingsSecurityController : SettingsController() {
                 defaultValue = false
 
                 requireAuthentication(
-                    context as? FragmentActivity,
-                    context!!.getString(R.string.lock_with_biometrics),
+                    activity as? FragmentActivity,
+                    context.getString(R.string.lock_with_biometrics),
                     context.getString(R.string.confirm_lock_change),
                 )
             }