When registering API key for ASF usage, signalize it in the domain name

This way user knows it's us who generated it, even though other people may access it as well

ArchiSteamFarm/ArchiWebHandler.cs

@@ -2541,7 +2541,7 @@ namespace ArchiSteamFarm {
 			// Extra entry for sessionID
 			Dictionary<string, string> data = new Dictionary<string, string>(4, StringComparer.Ordinal) {
 				{ "agreeToTerms", "agreed" },
-				{ "domain", "localhost" },
+				{ "domain", "generated.by." + SharedInfo.AssemblyName.ToLowerInvariant() + ".localhost" },
 				{ "Submit", "Register" }
 			};