Previously: blur if previous and next state want it blurred.
New: blur if previous OR next state want it blurred.
As part of this, change the default from true to false. Only All
Apps currently sets it to true, meaning we blur workspace only
going to or from All Apps.
Fix: 405836159
Test: Launch app, quickly go home and to All Apps
Flag: com.android.launcher3.all_apps_blur
Change-Id: Ic52c5aa2dce7e1e107418952031574bc2e47e585