Set updateable:false explicitly in apex rules.

Currently, this is the default so this is a no-op,
But the default is changing to true.

Bug: 180375550
Test: Treehugger
Merged-In: I153e6f842e03a732bfa852b830e0f65050e9270f
Change-Id: I153e6f842e03a732bfa852b830e0f65050e9270f
3 files changed