Set Quick Response pref as MULTI_PROCESS.

Since telecom runs in a different process from the settings activity, it
can sometimes read a cached value for the quick responses. Adding this
flag ensures that it checks the backing file for modification to
prevent using stale values.

Bug: 18828265
Change-Id: Ib3d5ae282a8eca45648d58e69bc9670d6ff6e211