init: fix debuggable paths for recovery mode

Since recovery mode doesn't switch root to /first_stage_ramdisk, we need
to update the debuggable file paths for recovery mode. Without this,
adb needs to be authorized in recovery mode even with a debug
vendor_ramdisk.

Bug: 182612208
Test: verify adb is authorized on pixel 5
Signed-off-by: Will McVicker <willmcvicker@google.com>
Change-Id: I557429e1834efcdd92ba0e135377055ffa677137