Make collapsing toolbar load font synchronously

Since collapsing toolbar might load the font asynchronously, it caused
that some settings pages are seeing a flicker on its title. This change
is using TextAppearanceConfig.setShouldLoadFontSynchronously(true)
method to have title font load synchronously, which would remove the
flicker problem.

Bug: 182232144
Test: visual verified
1) Settings > Notifications > Notification history
2) See if there's a flicker on title

Change-Id: I80f5c5862ea6408bfb372d61a11122fb0240e45d