Restore blue color for sign-in button

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/views/devise/sessions/_new_base.html.haml

@@ -7,8 +7,6 @@
         = f.check_box :remember_me
         %span Remember me
   %div
-    = f.submit "Sign in", class: "btn-create btn"
+    = f.submit "Sign in", class: "btn-save btn"
     .pull-right
       = link_to "Forgot your password?", new_password_path(resource_name), class: "btn"
-
-