Fix the alignment of nested children in the Child widget

Problem to solve

In the current iteration of the Child widget for Work Items, when there are both nested children and un-nested present, they are aligned differently (where we would instead want them aligned together).

Additionally, how nested children are aligned with their parents is not as intended. The desired behavior is seen below.

current desired
nested-current nested-desired

/cc @mushakov @amandarueda

Edited by Nick Brandt