Don't set LOCAL_SDK_RES_VERSION to current if LOCAL_SDK_VERSION is core_current

Removing AAPT1 support removed the distinction between unset
LOCAL_USE_AAPT2 and LOCAL_USE_AAPT2 := true, which enabled the
LCOAL_SDK_RES_VERSION setting for some modules that had previously
bypassed it because of LOCAL_USE_AAPT2 := true.  The workaround
was too broad, it shouldn't apply if LOCAL_SDK_VERSION is already
set to *current.  In particular, if it is core_current to disable
using framework-res.apk completely, then LOCAL_SDK_RES_VERSION
must not be set to current.

Fixes: 130782219
Test: atest android.server.wm.PrereleaseSdkTest
Change-Id: I250d65b1ef66e591f2c9779580df4cc3f0f2b028