Revert "win_security_policy: allow removing values (resolves #40869) (#41125)" (#41986)

This reverts commit f2bd6b6bfd.

lib/ansible/modules/windows/win_security_policy.ps1

@@ -194,8 +194,6 @@ if ($will_change -eq $true) {
             if ($new_value -cne $value) {
                 Fail-Json $result "Failed to change the value for key '$key' in section '$section', the value is still $new_value"
             }
-        } elseif ([string]$value -eq "") {
-            # Value was empty, so OK if no longer in the result
         } else {
             Fail-Json $result "The key '$key' in section '$section' is not a valid key, cannot set this value"
         }

test/integration/targets/win_security_policy/tasks/tests.yml

@@ -131,41 +131,3 @@
     that:
     - change_existing_string_again is not changed
     - change_existing_string_again.value == "New Guest"
-
-- name: add policy setting
-  win_security_policy:
-    section: Privilege Rights
-    # following key is empty by default
-    key: SeCreateTokenPrivilege
-    # add Guests
-    value: '*S-1-5-32-546'
-    
-- name: get actual policy setting
-  test_win_security_policy:
-    section: Privilege Rights
-    key: SeCreateTokenPrivilege
-  register: add_policy_setting_actual
-  
-- name: assert remove policy setting
-  assert:
-    that:
-    - add_policy_setting_actual.value == '*S-1-5-32-546'
-  
-- name: remove policy setting
-  win_security_policy:
-    section: Privilege Rights
-    key: SeCreateTokenPrivilege
-    value: ''
-  register: remove_policy_setting
-
-- name: get actual policy setting
-  test_win_security_policy:
-    section: Privilege Rights
-    key: SeCreateTokenPrivilege
-  register: remove_policy_setting_actual
-
-- name: assert remove policy setting
-  assert:
-    that:
-    - remove_policy_setting is changed
-    - remove_policy_setting_actual.value is none