Enable contact photo preloading.

Avoids the delay occuring otherwise when checking into call details.

Change-Id: Ie48285bb03fde0434429079f141ec57dc75a65b9
Refresh adapter on resuming, so that call dates are updated.

When not doing this, the call dates might be wrong (they might e.g. say
'5 minutes ago' even though the call was 2 hours ago).

Change-Id: I44b797e7d09fcfe5ad1745e6b4d2cba2639c1650
JIRA:CYAN-1455