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.

tests/app/main/views/test_manage_users.py

@@ -3,6 +3,7 @@ import copy
 import pytest
 from bs4 import BeautifulSoup
 from flask import url_for
+from tests.conftest import service_one as create_sample_service
 from tests.conftest import (
     SERVICE_ONE_ID,
     active_user_manage_template_permission,
@@ -11,7 +12,6 @@ from tests.conftest import (
     active_user_with_permissions,
     normalize_spaces,
 )
-from tests.conftest import service_one as create_sample_service
 
 import app
 from app.notify_client.models import InvitedUser

tests/app/main/views/test_templates.py

@@ -11,6 +11,7 @@ from tests import (
     template_json,
     validate_route_permission,
 )
+from tests.conftest import service_one as create_sample_service
 from tests.conftest import (
     SERVICE_ONE_ID,
     mock_get_service_email_template,
@@ -18,9 +19,8 @@ from tests.conftest import (
     mock_get_service_template,
     no_letter_contact_blocks,
     normalize_spaces,
+    single_letter_contact_block,
 )
-from tests.conftest import service_one as create_sample_service
-from tests.conftest import single_letter_contact_block
 
 from app.main.views.templates import (
     get_human_readable_delta,

tests/app/notify_client/test_template_statistics_client.py

@@ -1,8 +1,7 @@
 import uuid
 
-from app.notify_client.template_statistics_api_client import (
-    TemplateStatisticsApiClient,
-)
+from app.notify_client.template_statistics_api_client import \
+    TemplateStatisticsApiClient
 
 
 def test_template_statistics_client_calls_correct_api_endpoint_for_service(mocker, api_user_active):