Kernel: Return a correct name string of async write request

Author: https://github.com/supercomputer7
Commit: https://github.com/SerenityOS/serenity/commit/f36feb42bdd
Pull-request: https://github.com/SerenityOS/serenity/pull/4443

Kernel/Devices/BlockDevice.h

@@ -55,7 +55,7 @@ public:
         case Read:
             return "BlockDeviceRequest (read)";
         case Write:
-            return "BlockDeviceRequest (read)";
+            return "BlockDeviceRequest (write)";
         default:
             ASSERT_NOT_REACHED();
         }