Revert "Inconsistent account naming" (neo-project#329)

* Revert "Inconsistent account naming (neo-project#305)"

This reverts commit de55d4f.

* Update .gitignore

.gitignore

@@ -419,4 +419,4 @@ src/neoxp/default.neo-express
 src/trace/*.neo-trace
 src/worknet/default.neo-worknet
 src/worknet/data/*
-/src/neoxp/Properties/launchSettings.json
+src/neoxp/Properties/launchSettings.json

src/neoxp/Extensions/ExpressNodeExtensions.cs

@@ -152,11 +152,10 @@ public static async Task<ContractParameterParser> GetContractParameterParserAsyn
 
         public static async Task<OneOf<UInt160, None>> TryGetAccountHashAsync(this IExpressNode expressNode, ExpressChain chain, string name)
         {
-            if (name.StartsWith('@'))
+            if (name.StartsWith('#'))
             {
-                name = name[1..];
                 var contracts = await expressNode.ListContractsAsync().ConfigureAwait(false);
-                if (TryGetContractHash(contracts, name, out var contractHash))
+                if (TryGetContractHash(contracts, name.Substring(1), out var contractHash))
                 {
                     return contractHash;
                 }