Remove `organization` from the user JSON API schema

Signed-off-by: Rémy Coutable <remy@rymai.me>

spec/fixtures/api/schemas/user/login.json

@@ -16,7 +16,6 @@
     "linkedin",
     "twitter",
     "website_url",
-    "organization",
     "last_sign_in_at",
     "confirmed_at",
     "theme_id",

spec/fixtures/api/schemas/user/public.json

@@ -16,7 +16,6 @@
     "linkedin",
     "twitter",
     "website_url",
-    "organization",
     "last_sign_in_at",
     "confirmed_at",
     "theme_id",
@@ -51,7 +50,6 @@
     "linkedin": { "type": "string" },
     "twitter": { "type": "string "},
     "website_url": { "type": "string" },
-    "organization": { "type": ["string", "null"] },
     "last_sign_in_at": { "type": "date" },
     "confirmed_at": { "type": ["date", "null"] },
     "theme_id": { "type": "integer" },