renamed static vars to be consistent

src/main/java/org/gitlab4j/api/webhook/DeploymentEvent.java

@@ -5,7 +5,7 @@ import org.gitlab4j.api.utils.JacksonJson;
 
 public class DeploymentEvent extends AbstractEvent {
 
-    public static final String JOB_HOOK_X_GITLAB_EVENT = "Deployment Hook";
+    public static final String X_GITLAB_EVENT = "Deployment Hook";
     public static final String OBJECT_KIND = "deployment";
 
     private String status;

src/main/java/org/gitlab4j/api/webhook/ReleaseEvent.java

@@ -4,7 +4,7 @@ import org.gitlab4j.api.utils.JacksonJson;
 
 public class ReleaseEvent extends AbstractEvent {
 
-    public static final String JOB_HOOK_X_GITLAB_EVENT = "Release Hook";
+    public static final String X_GITLAB_EVENT = "Release Hook";
     public static final String OBJECT_KIND = "release";
 
     private Integer id;

src/main/java/org/gitlab4j/api/webhook/WebHookManager.java

@@ -105,8 +105,8 @@ public class WebHookManager implements HookManager {
             case PushEvent.X_GITLAB_EVENT:
             case TagPushEvent.X_GITLAB_EVENT:
             case WikiPageEvent.X_GITLAB_EVENT:
-            case DeploymentEvent.JOB_HOOK_X_GITLAB_EVENT:
-            case ReleaseEvent.JOB_HOOK_X_GITLAB_EVENT:
+            case DeploymentEvent.X_GITLAB_EVENT:
+            case ReleaseEvent.X_GITLAB_EVENT:
                 break;
 
         default: