Only re-enable contaminant detection when port is present

Contaminant detection is re-enabled when the disconnected port's
portStatus has contaminant detection disabled. During port removal,
there is no reason why contamiant detection has to re-enabled since
the port is anyways being teared down.

Bug: 129696344
Test: dumpsys usb add-port "matrix" ufp;
dumpsys usb remove-port "matrix" ufp

Change-Id: Ie146db82d93414e90ee99b4d17ec0ba5ada2ce83