fix: correct whitespace in IntegerField error

Author: jaredhendrickson13

pfSense-pkg-RESTAPI/files/usr/local/pkg/RESTAPI/Fields/IntegerField.inc

@@ -142,8 +142,8 @@ class IntegerField extends Field {
 
         # Otherwise, the internal value cannot be represented by this Field. Throw an error.
         throw new RESTAPI\Responses\ServerError(
-            message: "Cannot parse IntegerField '$this->name' from internal because its internal value is not
-                    a numeric value. Consider changing this field to a StringField.",
+            message: "Cannot parse IntegerField '$this->name' from internal because its internal value is not a " .
+                "numeric value. Consider changing this field to a StringField.",
             response_id: 'INTEGER_FIELD_WITH_NON_INTEGER_INTERNAL_VALUE',
         );
     }