change to sso login on both sign in buttons

public/views/index/body.ejs

@@ -52,7 +52,7 @@
                     <% if (authProviders.facebook || authProviders.twitter || authProviders.github || authProviders.gitlab || authProviders.mattermost || authProviders.dropbox || authProviders.google || authProviders.ldap || authProviders.saml || authProviders.oauth2 || authProviders.email) { %>
                     <span class="ui-signin">
                         <br>
-                        <a type="button" class="btn btn-lg btn-success ui-signin" data-toggle="modal" data-target=".signin-modal" style="min-width: 200px;"><%= __('Sign In') %></a>
+                        <a href="<%- serverURL %>/auth/saml" type="button" class="btn btn-lg btn-success ui-signin" data-toggle="modal" style="min-width: 200px;"><%= __('Sign In') %></a>
                     </span>
                     <span class="ui-or"><%= __('or') %></span>
                     <% } %>