Use addWhere() method in opSimple()

Here's a patch with the switch from using addWhereExpression() to addWhere().

Updated patch that conditionally uses `addWhere()` when the query object does not have an `addWhereExpression()` method.

Fixed patch paths.

Why do you want to use addWhere conditionally and not in all cases?

We had come across an instance where the value had to be added as an expression (it used a mysql date function). However the original issue we had was an incompatibility with google_analytics_reports query (see https://git.drupalcode.org/project/google_analytics_reports/-/blob/4.0.x..., doesn't have an addWhereExpression() method) and the simple addWhere() was sufficient. If I recall correctly, the field returned the mysql date function as the field value.