win_reg_stat: Clean up parameter handling (#21380)

lib/ansible/modules/windows/win_reg_stat.ps1

@@ -20,13 +20,13 @@
 $ErrorActionPreference = "Stop"
 
 $params = Parse-Args $args -supports_check_mode $true
-$key = Get-AnsibleParam $params "key" -FailIfEmpty $true
+
-$property = Get-AnsibleParam $params "property" -FailIfEmpty $false -default $null
+$key = Get-AnsibleParam -obj $params -name "key" -type "str" -failifempty $true
+$property = Get-AnsibleParam -obj $params -name "property" -type "str"
 
 $result = @{
-    win_reg_stat = @{}
     changed = $false
-    warnings = @()
+    win_reg_stat = @{}
 }
 
 Function Get-NetHiveName($hive) {