Fix MySQL port configuration option

A simple copy and paste error prevents the MySQL port in the
configuration from being used as part of the database connection.
12 jobs for <span class="ref-name">fix-mysql</span> in 16 minutes and 7 seconds (queued for 1 second)
Status Job ID Name Coverage
  Sqlite
passed #129568
sqlite1

00:03:49

passed #129569
sqlite2

00:03:41

passed #129578
sqlite3

00:03:41

passed #129577
sqlite3

00:03:41

failed #129570
sqlite3

00:03:41

 
  Postgresql
passed #129571
postgresql1

00:03:46

passed #129572
postgresql2

00:00:50

passed #129573
postgresql3

00:03:56

 
  Mysql
passed #129574
mysql1

00:03:52

passed #129575
mysql2

00:03:50

passed #129579
mysql3

00:00:47

failed #129576
mysql3

00:00:44