Merge branch 'm_2000741_expression_bugfix' into '2021.2.1'

[Projekt: xRM-Marketing][TicketNr.:...

See merge request xrm/basic!1427

entity/BulkMail_entity/recordcontainers/db/recordfieldmappings/active.value/expression.js

 import("system.result");
 
-result.string("true");
\ No newline at end of file
+result.string("'true'");
\ No newline at end of file