Fix deprecated constructor by calling as this

Author: jdmulloy

src/main/java/org/jenkinsci/plugins/GithubSecurityRealm.java

@@ -148,6 +148,19 @@ public GithubSecurityRealm(String githubWebUri,
         this.forceGithubEmail  = forceGithubEmail;
     }
 
+    /**
+       This method is deprecated.
+       @deprecated use GithubSecurityRealm(githubWebUri, githubApiUri, clientID, clientSecret, oauthScopes, emailDomains, forceGithubEmail)
+     */
+    @Deprecated
+    public GithubSecurityRealm(String githubWebUri,
+                 String githubApiUri,
+                 String clientID,
+                 String clientSecret,
+                 String oauthScopes) {
+        this(githubWebUri, githubApiUri, clientID, clientSecret, oauthScopes, "", false);
+    }
+
     private GithubSecurityRealm() {    }
 
     /**