Fixes issue in modal displaying group name

components/device-mgt/org.wso2.carbon.device.mgt.api/src/main/java/org/wso2/carbon/device/mgt/jaxrs/service/impl/GroupManagementServiceImpl.java

@@ -110,7 +110,7 @@ public class GroupManagementServiceImpl implements GroupManagementService {
             log.error(msg, e);
             return Response.status(Response.Status.INTERNAL_SERVER_ERROR).entity(msg).build();
         } catch (GroupAlreadyExistException e) {
-            String msg = "Group already exists with name \'" + group.getName() + "\'.";
+            String msg = "Group already exists with name " + group.getName() + ".";
             log.warn(msg);
             return Response.status(Response.Status.CONFLICT).entity(msg).build();
         }