Update sphereflake.reference_output.small for changes in sqrt()

r208341 changed the sqrt used in sphereflake, but only updated
'sphereflake.reference_output'. This changes the small output to
match.

Patch by Robert Lytton! Thanks!

git-svn-id: https://llvm.org/svn/llvm-project/test-suite/trunk@208801 91177308-0d34-0410-b5e6-96231b3b80d8