Revert "Fix nameable mapping"

This reverts commit 8217c52.

mappings/net/minecraft/util/Nameable.mapping

@@ -12,5 +12,5 @@ CLASS net/minecraft/class_1275 net/minecraft/util/Nameable
 		COMMENT
 		COMMENT <p>This should return {@linkplain #getCustomName the custom name} if it exists,
 		COMMENT otherwise the default name. This should not have styling applied.
-	METHOD method_5797 getDisplayName ()Lnet/minecraft/class_2561;
+	METHOD method_5797 method_5797 ()Lnet/minecraft/class_2561;
 		COMMENT {@return the custom name of this object, or {@code null} if there is none}