Enable contact photo preloading.

Avoids the delay occuring otherwise when checking into call details.

Change-Id: Ie48285bb03fde0434429079f141ec57dc75a65b9
Hide 'set default' checkbox if it's not going to be looked at next time
anyway.

Change-Id: I2eb5559c3c0b61481d4f526b2198fd0372163d65