Don't depend on R.txt)

There is an extra ) in the implicit output path for R.txt, which causes
the rule to rerun every time because of a missing output file.  There
is already an implicit output for R.txt on line 180 (which is why
the incorrect path didn't cause an immediate "No rule to generate R.txt"
error), so just remove the incorrect one.

Bug: 77244156
Test: m checkbuild && m checkbuild
Change-Id: Id960ee211b89a9a5f5104cdcac23bc3124742145