Merge branch 'patch-2' into 'master'

Update cron.inc.php

See merge request ispconfig/ispconfig3!710

server/lib/classes/cron.inc.php

@@ -264,9 +264,10 @@ class cron {
 		if(!array_key_exists($sField, $this->_aValidValues)) return false;
 
 		reset($this->_aValidValues[$sField]);
-		while(($cur = each($this->_aValidValues[$sField])) !== false) {
-			if($bIncludeCurrent == true && $cur['value'] >= $iValue) return $cur['value'];
-			elseif($cur['value'] > $iValue) return $cur['value'];
+		
+		foreach($this->_aValidValues[$sField] as $key => $value) {
+		    if($bIncludeCurrent == true && $value >= $iValue) return $value;
+		    elseif($value > $iValue) return $value;
 		}
 		return reset($this->_aValidValues[$sField]);
 	}