Code Quality: Simplify boolean assignments.

This makes minor code simplifications by removing unnecessary ternary operations and directly assigning boolean expressions. These changes make the code easier to read and maintain, but do not alter the underlying logic.

Props Soean.
See #64898.

git-svn-id: https://develop.svn.wordpress.org/trunk@62173 602fd350-edb4-49c9-b593-d223f7449a82