It's observed by danmarsden in MDLQA-7996, that this check should be done while installing a new site as well.
MDL-46963 issue just checked for tables and is not reported for new moodle install. This leads to creation of tables with wrong format.
Either we should notify this or modified tables after installation is complete.

Steps to reproduce:

1. Add below lines to my.cnf

   innodb_file_format=Antelope

   innodb_file_per_table=5

2. Install moodle site and you won't be notified about wrong db on environment check page
3. Go to Site administration ► Server ► Environment
4. And you will see unsupported_db_table_row_format warning.