Fixes no edge extension in Settings

This is a regression by commit 75847354. Clicking on the list
items on the primary TF on Settings will start a new and adjacent
secondary TF. In that case, the original secondary TF no longer
has an adjacent TF and therefore is evaluated as a translucent
change.

Skip adding edge extension for translucent Activity only.

Bug: 319169778
Test: verify on Settings
Change-Id: I16311c31f2b83c246e96c2c01975f45011548fa4