LibSQL: Remove the now-unused ExecutionContext::result object

The INSERT and SELECT statements set up this object for any expression
evaluation to indicate errors. This is no longer needed.

Userland/Libraries/LibSQL/AST/Statement.cpp

@@ -13,7 +13,7 @@ namespace SQL::AST {
 
 ResultOr<ResultSet> Statement::execute(AK::NonnullRefPtr<Database> database) const
 {
-    ExecutionContext context { move(database), {}, this, nullptr };
+    ExecutionContext context { move(database), this, nullptr };
     return execute(context);
 }