DEV: Fix Lint/BooleanSymbol (#24747)

plugins/chat/spec/system/channel_message_upload_spec.rb

@@ -28,7 +28,7 @@ RSpec.describe "Channel message selection", type: :system do
     chat.visit_channel(channel_1)
 
     find(".chat-message-collapser-button").click
-    expect(page).to have_css(".chat-message-collapser-body.hidden", visible: :false)
+    expect(page).to have_css(".chat-message-collapser-body.hidden", visible: false)
     find(".chat-message-collapser-button").click
     expect(page).to have_no_css(".chat-message-collapser-body.hidden")
     find(".chat-img-upload").click

plugins/discourse-narrative-bot/plugin.rb

@@ -90,7 +90,7 @@ after_initialize do
     end
 
     class CertificatesController < ::ApplicationController
-      layout :false
+      layout false
       skip_before_action :check_xhr
       requires_login