Fix HAML in devise/passwords/edit.html.haml

Signed-off-by: Takuya Noguchi <takninnovationresearch@gmail.com>

app/views/devise/passwords/edit.html.haml

-= render 'devise/shared/tab_single', tab_title:'Change your password'
+= render 'devise/shared/tab_single', tab_title: 'Change your password'
 .login-box
   .login-body
     = form_for(resource, as: resource_name, url: password_path(:user), html: { method: :put, class: 'gl-show-field-errors' }) do |f|