add missing replacement for Firebird and SQLite

Author: ahmad-moussawi

QueryBuilder/Compilers/FirebirdCompiler.cs

@@ -39,7 +39,7 @@ public override string CompileLimit(SqlResult ctx)
                 ctx.Bindings.Add(offset + 1);
                 ctx.Bindings.Add(limit + offset);
 
-                return "ROWS ? TO ?";
+                return $"ROWS {parameterPlaceholder} TO {parameterPlaceholder}";
             }
 
             return null;
@@ -59,15 +59,15 @@ protected override string CompileColumns(SqlResult ctx)
 
                 ctx.Query.ClearComponent("limit");
 
-                return "SELECT FIRST ?" + compiled.Substring(6);
+                return $"SELECT FIRST {parameterPlaceholder}" + compiled.Substring(6);
             }
             else if (limit == 0 && offset > 0)
             {
                 ctx.Bindings.Insert(0, offset);
 
                 ctx.Query.ClearComponent("offset");
 
-                return "SELECT SKIP ?" + compiled.Substring(6);
+                return $"SELECT SKIP {parameterPlaceholder}" + compiled.Substring(6);
             }
 
             return compiled;

QueryBuilder/Compilers/SqliteCompiler.cs

@@ -7,8 +7,6 @@ namespace SqlKata.Compilers
     public class SqliteCompiler : Compiler
     {
         public override string EngineCode { get; } = EngineCodes.Sqlite;
-        protected override string parameterPlaceholder { get; set; } = "?";
-        protected override string parameterPrefix { get; set; } = "@p";
         protected override string OpeningIdentifier { get; set; } = "\"";
         protected override string ClosingIdentifier { get; set; } = "\"";
         protected override string LastId { get; set; } = "select last_insert_rowid() as id";
@@ -31,7 +29,7 @@ public override string CompileLimit(SqlResult ctx)
             if (limit == 0 && offset > 0)
             {
                 ctx.Bindings.Add(offset);
-                return "LIMIT -1 OFFSET ?";
+                return $"LIMIT -1 OFFSET {parameterPlaceholder}";
             }
 
             return base.CompileLimit(ctx);