Update Fresco to 1.5.0.
Update Fresco to 1.5.0.

With cautious optimism, I'm hoping that this update might fix the
inconsistent image loading behavior that some of us have seen on lower-end
devices.  At the very least, I can no longer reproduce the inconsistent
behavior on my old device with this update.

(No breaking changes for us, and no changes to the "samples" code.)

Bug: T173896
Change-Id: I0d938eb473f2aeb1cf1d10d786bf4ad9c30c9e61

wikimedia/apps-android-wikipedia,wikimedia/apps-android-wikipedia,dbrant/apps-android-wikipedia,dbrant/apps-android-wikipedia,wikimedia/apps-android-wikipedia,dbrant/apps-android-wikipedia,dbrant/apps-android-wikipedia,dbrant/apps-android-wikipedia,wikimedia/apps-android-wikipedia