fix(move-mail): #MZI-192 fix move mail from parent to a sub folder

[Alex-Delaveau]

Describe your changes

Fix an issue where subfolder wasnt shown in move mail lightbox if the mail was in the parent folder.

Checklist tests

Select a mail from a folder that have subfolder, try to move it and check if the sub folders appear in the lightbox

Issue ticket number and link

MZI-192

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)