fix(standards): cast retention days to integer

Convert `AgeLimitForRetention` from `TimeSpan.TotalDays` to an integer before state comparison in `Invoke-CIPPStandardRetentionPolicyTag`. This avoids decimal day values causing false drift detection when validating retention policy tag settings.

Author: Zacgoose

Modules/CIPPStandards/Public/Standards/Invoke-CIPPStandardRetentionPolicyTag.ps1

@@ -59,7 +59,7 @@ function Invoke-CIPPStandardRetentionPolicyTag {
     }
 
     $CurrentAgeLimitForRetention = if ($CurrentState.AgeLimitForRetention) {
-        ([timespan]$CurrentState.AgeLimitForRetention).TotalDays
+        [int]([timespan]$CurrentState.AgeLimitForRetention).TotalDays
     }
 
     $StateIsCorrect = ($CurrentState.Name -eq $PolicyName) -and