fix(freeLayout): #MAG-304 fix free layout card-list size

[alicedraillard]

Describe your changes

fix board size when cards are present in free layout

Checklist tests

create free layout board with one card, check board height

Issue ticket number and link

MAG-304

Checklist before requesting a review (magic string, indentation, comment/documentation...)

• I have detailed the tests to do in my feature/fix in order to prevent consequents regressions (must specify in Checklist tests)
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (API Doc etc...) - (must specify in Description for target version)
• If it is a consequent feature, I have added thorough tests.
• I have added tests that prove my fix is effective or that my feature works
• Any dependent changes have been added to this project (must specify in Description)