Add btn-default class for social buttons in login and signup page

app/views/devise/shared/_omniauth_box.html.haml

@@ -7,7 +7,7 @@
   .d-flex.justify-content-between.flex-wrap
     - providers.each do |provider|
       - has_icon = provider_has_icon?(provider)
-      = button_to omniauth_authorize_path(:user, provider), id: "oauth-login-#{provider}", class: "gl-button btn d-flex align-items-center omniauth-btn text-left oauth-login #{qa_class_for_provider(provider)}" do
+      = button_to omniauth_authorize_path(:user, provider), id: "oauth-login-#{provider}", class: "btn gl-button btn-default d-flex align-items-center omniauth-btn text-left oauth-login #{qa_class_for_provider(provider)}" do
         - if has_icon
           = provider_image_tag(provider)
         %span

app/views/devise/shared/_signup_omniauth_provider_list.haml

@@ -2,7 +2,7 @@
   = _("Create an account using:")
 .d-flex.justify-content-between.flex-wrap
   - providers.each do |provider|
-    = link_to omniauth_authorize_path(:user, provider), method: :post, class: "btn gl-button gl-display-flex gl-align-items-center gl-text-left gl-mb-2 gl-p-2 omniauth-btn oauth-login #{qa_class_for_provider(provider)}", id: "oauth-login-#{provider}" do
+    = link_to omniauth_authorize_path(:user, provider), method: :post, class: "btn gl-button btn-default gl-display-flex gl-align-items-center gl-text-left gl-mb-2 gl-p-2 omniauth-btn oauth-login #{qa_class_for_provider(provider)}", id: "oauth-login-#{provider}" do
       - if provider_has_icon?(provider)
         = provider_image_tag(provider)
       %span.ml-2

changelogs/unreleased/gl-button-social.yml

+---
+title: Add btn-default class for social buttons in login and signup page
+merge_request: 53347
+author: Yogi (@yo)
+type: other