Mark constructor as public

Author: msm1992

components/apimgt/org.wso2.carbon.apimgt.rest.api.util/src/main/java/org/wso2/carbon/apimgt/rest/api/util/exception/GlobalThrowableMapper.java

@@ -43,7 +43,7 @@ public class GlobalThrowableMapper implements ExceptionMapper<Throwable> {
 
     private ErrorDTO e500 = new ErrorDTO();
 
-    GlobalThrowableMapper() {
+    public GlobalThrowableMapper() {
         e500.setCode((long) 500);
         e500.setMessage("Internal server error");
         e500.setMoreInfo("");