Revert "[browser] fix code gen overflow (dotnet#110539)" (dotnet#110599)

This reverts commit 1fa2361.

src/libraries/System.Runtime.InteropServices.JavaScript/gen/JSImportGenerator/JSSignatureContext.cs

@@ -48,7 +48,6 @@ public static JSSignatureContext Create(
 
             // there could be multiple method signatures with the same name, get unique signature name
             uint hash = 17;
-            int typesHash;
             unchecked
             {
                 foreach (var param in sigContext.ElementTypeInformation)
@@ -58,8 +57,8 @@ public static JSSignatureContext Create(
                     foreach (char c in param.ManagedType.FullTypeName)
                         hash = hash * 31 + c;
                 }
-                typesHash = (int)(hash & int.MaxValue);
             };
+            int typesHash = Math.Abs((int)hash);
 
             var fullName = $"{method.ContainingType.ToDisplayString()}.{method.Name}";
             string qualifiedName = GetFullyQualifiedMethodName(env, method);