Camera: Fix removal of histogram setting

Histogram is disabled by default in config.xml, so the code to filter unsupported modes is never executed
Remove histogram option completely when it's disabled in config.xml

Change-Id: Id47da14d7d3d268e70727d25ed8f4d431b80f6f1
Camera: Fix JPEG quality DB update

Change-Id: I4e43152d8a4a8ed689de086757bcabc17749f9c8