Reducing the time for expected launcher initialization back to 10 sec

It was temporarily raised to 60 sec.

https://googleplex-android-review.git.corp.google.com/9563509
should've fixed some problems with loading time, but likely not all.

We need to observe whether this test starts flaking again.

testDragIcon will run only in Launcher postsubmit, and won't block
merges to platform if it fails.

Bug: 142514365
Change-Id: I2b9a9d043346ebda721221cefd6118a1a799501f