dont use has_permissions to check for platform admins

platform_admin is a separate concept to permissions, so by removing the
checks for it from the current_user.has_permissions function, we can
simplify things greatly. We already record on the user whether they're
a platform admin anyway.

app/main/views/inbound_number.py

@@ -3,12 +3,12 @@ from flask_login import login_required
 
 from app import inbound_number_client
 from app.main import main
-from app.utils import user_has_permissions
+from app.utils import user_is_platform_admin
 
 
 @main.route('/inbound-sms-admin', methods=['GET', 'POST'])
 @login_required
-@user_has_permissions(admin_override=True)
+@user_is_platform_admin
 def inbound_sms_admin():
     data = inbound_number_client.get_all_inbound_sms_number_service()