Gallery2: fix crash after editing min/max port value

No permission to set system property when save Min or Max port.

The Min or Max port save to preference, not need to set to system property,
so it can remove to avoid permission issue.

Change-Id: I134b2b01bb9204c337e4f5a5b59863195bb40509
CRs-Fixed: 1004667
1 file changed