ProtectedApps pattern lock for landscape mode.

Change-Id: I9ef70a0e363d4d17510188d24f4742f458fba38e
Fix keyboard opening on pattern entry.

For protected apps, on some devices (consistent repro on flo), the soft
keyboard will open every time you enter the LockPatternActivity. Fix
this by setting the keyboard state to hidden in the manifest for this
activity.

Change-Id: I56fb6644cacd7a05100199637b1a27159ca04829