Do not disable effect in AudioEffect destructor.

Current implementation of AudioEffect class destructor disables
the effect before disconnecting from IAudioEffect interface.
This is problematic when more than one client has a handle on the same
effect engine as destroying one handle will disable the effect which is
not the intended behavior.

Change-Id: I10eacf981506469a7ef4eb9a1650813f0848de5d

media/libmedia/AudioEffect.cpp

@@ -170,7 +170,6 @@ AudioEffect::~AudioEffect()
     LOGV("Destructor %p", this);
 
     if (mStatus == NO_ERROR || mStatus == ALREADY_EXISTS) {
-        setEnabled(false);
         if (mIEffect != NULL) {
             mIEffect->disconnect();
             mIEffect->asBinder()->unlinkToDeath(mIEffectClient);