Amend the reference to JabRefReferences initialization (#5487)

The former filename does not exist, the updated file being referred does contain the initialization of JabRefPreferences.
If the previous name is kept, new contributors could potentially be confused when looking for the file.

Author: cmoralesmx

src/main/java/org/jabref/Globals.java

@@ -40,7 +40,7 @@ public class Globals {
     public static final RemoteListenerServerLifecycle REMOTE_LISTENER = new RemoteListenerServerLifecycle();
     public static final ImportFormatReader IMPORT_FORMAT_READER = new ImportFormatReader();
     public static final TaskExecutor TASK_EXECUTOR = new DefaultTaskExecutor();
-    // In the main program, this field is initialized in JabRef.java
+    // In the main program, this field is initialized in JabRefMain.java
     // Each test case initializes this field if required
     public static JabRefPreferences prefs;
     /**