Revert "set appcompat menu class to obfuscate-only in PG"

This reverts commit 899afa2092.

Was able to reproduce a crash with this in second test that was actually
resolved in the previous proguard. Reverting.

proguard.cfg

@@ -1,6 +1,5 @@
 -keepattributes **
--keep class !org.spongycastle.asn1.**,!org.spongycastle.crypto.ec.**,!org.spongycastle.x509.**,** {*;}
--keep, allowobfuscation class android.support.v7.internal.view.menu.** {*;}
+-keep class !android.support.v7.internal.view.menu.**,!org.spongycastle.asn1.**,!org.spongycastle.crypto.ec.**,!org.spongycastle.x509.**,** {*;}
 -dontpreverify
 -dontoptimize
 -dontwarn **