extract_utils: Fix device online check

* No need to look for /sbin/recovery as adbd will report
   the device as being in recovery mode already. Also, this
   check appears to hang on N.

Change-Id: I3bcb427835ae3cd37c7ea56cbc57bba0d18fcc04

build/tools/extract_utils.sh

@@ -499,8 +499,7 @@ EOF
 # Return success if adb is up and not in recovery
 function _adb_connected {
     {
-        if [[ "$(adb get-state)" == device &&
-              "$(adb shell test -e /sbin/recovery; echo $?)" == 0 ]]
+        if [[ "$(adb get-state)" == device ]]
         then
             return 0
         fi