tests: Don't use undefined variable

The test.environment variable was removed from the variables defined in
tests.yml in commit 1b207227f3, but it's still used, which causes
Ansible to break:
  The task includes an option with an undefined variable. The error was:
  'dict object' has no attribute 'environment'. 'dict object' has no
  attribute 'environment'

Resolves: RHEL-61579

tests/roles/run_bats_tests/tasks/run_one_test.yml

@@ -15,7 +15,6 @@
     local_environment:
       TEST_NAME:    "{{ test.name }}"
       TEST_PACKAGE: "{{ test.package }}"
-      TEST_ENV:     "{{ test.environment }}"
 
 - name: "{{ test.name }} | setup/teardown helper | see if exists"
   local_action: stat path={{ role_path }}/files/helper.{{ test_name_oneword }}.sh
@@ -31,7 +30,7 @@
     chdir: /usr/share/{{ test.package }}/test/system
   become: "{{ true if test.become is defined else false }}"
   become_user: testuser
-  environment: "{{ local_environment | combine(test.environment) }}"
+  environment: "{{ local_environment }}"
 
 - name: "{{ test.name }} | pull logs"
   fetch: