Fixes issue while trying to disable last enabled Agent feature element

Fixes #74

Author: LordHepipud

lib/core/icingaagent/getters/Get-IcingaAgentFeatures.psm1

@@ -6,12 +6,12 @@ function Get-IcingaAgentFeatures()
     $DisabledFeatures = ($ConfigResult.Message.SubString(
         0,
         $ConfigResult.Message.IndexOf('Enabled features')
-    )).Replace('Disabled features: ', '').Replace("`r`n", '');
+    )).Replace('Disabled features: ', '').Replace("`r`n", '').Replace("`r", '').Replace("`n", '');
 
     $EnabledFeatures  = ($ConfigResult.Message.SubString(
         $ConfigResult.Message.IndexOf('Enabled features'),
         $ConfigResult.Message.Length - $ConfigResult.Message.IndexOf('Enabled features')
-    )).Replace('Enabled features: ', '').Replace("`r`n", '');
+    )).Replace('Enabled features: ', '').Replace("`r`n", '').Replace("`r", '').Replace("`n", '');
 
     return @{
         'Enabled'  = ($EnabledFeatures.Split(' '));