fix an accidental change that broke Reactive

Author: gavinking

hibernate-core/src/main/java/org/hibernate/sql/results/graph/entity/internal/EntityInitializerImpl.java

@@ -2112,7 +2112,7 @@ public boolean isHasLazyInitializingSubAssemblers() {
 		return assemblers;
 	}
 
-	protected @Nullable BasicResultAssembler<?> discriminatorAssembler() {
+	protected @Nullable BasicResultAssembler<?> getDiscriminatorAssembler() {
 		return discriminatorAssembler;
 	}