Don't delete withres-withoutdex jar from R8 rules

R8 rules produce a depfile generated by R8.  R8 sees the withres-withoutdex
jar as an input, and so adds it to the depfile.  If the jar is deleted
after running R8 then ninja will always consider the rule dirty, as the
input file listed in the depfile is missing.

Fixes: 303064127
Test: m Calendar && m Calendar
Test: m framework-minus-apex &&  m framework-minus-apex
Change-Id: I5cbd780b56fc131b58598d6e569a8a78b7fe9395