Fix dependencies for obfuscated instrumentation tests

This path is never used, otherwise the dependency on
proguard.classes.jar would have triggered the checkbuild
dangling rules errors.  Remove the dependency on the
proguarded classes, which don't exist any more, and depend
on the proguard_options and proguard_dictionary files
instead.

Test: none
Change-Id: Ia3ebc3bc71f0d6fdfa4a7a6850e2f7021adfdd1a