Misc for netf

Doesn't make sense to check further if index points to the end of the string, this also handles previous check

ArchiSteamFarm/Compatibility/StaticHelpers.cs

@@ -136,7 +136,7 @@ namespace ArchiSteamFarm.Compatibility {
 			int startIndex = 0;
 
 			while (true) {
-				if (source.Length == 0) {
+				if (startIndex >= source.Length) {
 					return source;
 				}