libtracker-common: Do not push thread-default context in gconfdbus
libtracker-common: Do not push thread-default context in gconfdbus

We cannot always push the global default context as a thread-default
context. The previous commit makes sure that the thread-default context
is always set to the global default context.

outofbits/tracker,hoheinzollern/tracker,outofbits/tracker,outofbits/tracker,outofbits/tracker,hoheinzollern/tracker,hoheinzollern/tracker,outofbits/tracker,hoheinzollern/tracker,outofbits/tracker,hoheinzollern/tracker,hoheinzollern/tracker,hoheinzollern/tracker,outofbits/tracker