Forced close of design sections when clicking "Change theme" link
Forced close of design sections when clicking "Change theme" link

refs https://github.com/TryGhost/Admin/commit/7c013c55682a099a750299c159f8f92917d2d714

- nav menu felt inconsistent where clicking a section nav item closes all other sections but clicking the change-theme nav item didn't

TryGhost/Ghost-Admin,TryGhost/Ghost-Admin