Fix bug with string output parameters initialized without size [Pt. II]

Author: C0nquistadore

src/Dibix.Dapper/DapperDatabaseAccessor.cs

@@ -149,9 +149,9 @@ private static object NormalizeParameterValue(object value)
 
             switch (dbType)
             {
-                case DbType.String:
-                case DbType.StringFixedLength:
-                case DbType.AnsiString:
+                case DbType.String when isOutput:
+                case DbType.StringFixedLength when isOutput:
+                case DbType.AnsiString when isOutput:
                 case DbType.AnsiStringFixedLength when isOutput:
                     return -1;