Add PARTNER_SUPPORT_EMAIL in default FEATURES

PARTNER_SUPPORT_EMAIL gets used to display contact email for Studio support

playbooks/roles/edxapp/defaults/main.yml

@@ -115,6 +115,8 @@ EDXAPP_VIDEO_CDN_URLS:
 
 EDXAPP_CREDIT_HELP_LINK_URL: ""
 
+EDXAPP_PARTNER_SUPPORT_EMAIL: ''
+
 EDXAPP_PLATFORM_NAME: 'Your Platform Name Here'
 EDXAPP_STUDIO_NAME: 'Studio'
 EDXAPP_STUDIO_SHORT_NAME: 'Studio'
@@ -732,6 +734,7 @@ generic_env_config:  &edxapp_generic_env
   LMS_BASE: "{{ EDXAPP_LMS_BASE }}"
   CMS_BASE: "{{ EDXAPP_CMS_BASE }}"
   BOOK_URL:  "{{ EDXAPP_BOOK_URL }}"
+  PARTNER_SUPPORT_EMAIL: "{{ EDXAPP_PARTNER_SUPPORT_EMAIL }}"
   PLATFORM_NAME: "{{ EDXAPP_PLATFORM_NAME }}"
   STUDIO_NAME: "{{ EDXAPP_STUDIO_NAME }}"
   STUDIO_SHORT_NAME: "{{ EDXAPP_STUDIO_SHORT_NAME }}"