Use option "updateIfAlreadyExists" to make sure description of existing

groups are properly updated

The previous option "ignoreIfAlreadyExists" was used as workaround for
an UMAPI bug which was meanwhile fixed by Adobe.

This closes #721

accesscontroltool-bundle/src/main/java/biz/netcentric/cq/tools/actool/ims/request/CreateGroupStep.java

@@ -11,7 +11,7 @@ public class CreateGroupStep implements Step {
 
     // this cannot be a constant, but still needs to be serialized as literal
     @JsonProperty("option")
-    final String defaultOption = "ignoreIfAlreadyExists"; // the option "updateIfAlreadyExists" fails in case the group does already exist with a letter case, tracked in https://adminconsole.adobe.com/FA907D44536A3C2B0A490D4D@AdobeOrg/support/support-cases/E-001223901
+    final String defaultOption = "updateIfAlreadyExists";
     // unclear why name should be passed here as well: https://github.com/adobe-apiplatform/umapi-documentation/issues/87, doesn't seem necessary
     //@JsonProperty
     //String name;