Settings: Allow disabling default allcaps state in tabtext.

  Since the allcaps state is decided via an internal
  style within android, we have to manually override
  it programatically.

  Create "config_gcf_disable_default_tabtext_allcaps"
  for this purpose.

Change-Id: I38c8bd1d50dee7c1e6440ce747368ade4e2dab29
TICKET: PAELLA-167