chore: remove organization_id suffix from org_member roles in database (#13473)

Organization member's table is already scoped to an organization.
Rolename should avoid having the org_id appended.

Wipes all existing organization role assignments, which should not be used anyway.

coderd/database/dump.sql

@@ -576,7 +576,7 @@ CREATE TABLE organization_members (
     organization_id uuid NOT NULL,
     created_at timestamp with time zone NOT NULL,
     updated_at timestamp with time zone NOT NULL,
-    roles text[] DEFAULT '{organization-member}'::text[] NOT NULL
+    roles text[] DEFAULT '{}'::text[] NOT NULL
 );
 
 CREATE TABLE organizations (