Fixed minor typo in ProfileMessageSupport

Change-Id: I3ce60d4a9a1bb43bdec73ee2baebe8348a1de9b1
Reviewed-on: https://review.haiku-os.org/c/haiku/+/1974
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>

src/servers/app/ProfileMessageSupport.cpp

@@ -321,7 +321,7 @@ string_for_message_code(uint32 code)
 		CODE(AS_COLOR_MAP_UPDATED);
 
 		default:
-			return "unkown code";
+			return "unknown code";
 			break;
 	}
 }