fix: RSpec

Author: marsz

app/views/admin/users/edit.html.slim

@@ -1,6 +1,6 @@
 - content_for :btns do
   = render partial: "btns", object: @user, as: :user
 
-= admin_widget_box "Edit User", icon: :pencil do
+= admin_widget_box "Edit User" do
   = simple_form_for @user, as: :user, wrapper: :admin do |f|
     = render partial: "form", object: f, as: :f

app/views/admin/users/show.html.slim

@@ -1,7 +1,7 @@
 - content_for :btns do
   = render partial: "btns", object: @user, as: :user
 
-= admin_widget_box "User ##{@user.id}", icon: :th do
+= admin_widget_box "User ##{@user.id}" do
   table.table.table-bordered.table-striped.table-hover
     tbody
       tr