DNN-6239: Fixed DotNetNuke.Services.Upgrade.Internals.InstallControllerImpl.IsAbleToPerformDatabaseActions(string connectionString)

This pull requests fixes Fixed DotNetNuke.Services.Upgrade.Internals.InstallControllerImpl.IsAbleToPerformDatabaseActions(string connectionString): There is one "." too much (after {{databaseOwner}}). 
IMHO adding the {{objectQualifier}} is also a good idea.