check file order in apk_implant_signature

When first using common.apk_strip_signatures and then common.apk_implant_signature diffoscope gives me this:

% diffoscope urzip.orig.apk urzip.apk
|#################################################################|  100%                             Time: 0:00:00 
--- urzip.orig.apk
+++ urzip.apk
├── zipinfo {}
│ @@ -1,10 +1,10 @@
│ - Zip file size: 9969 bytes, number of entries: 8
│ + Zip file size: 9933 bytes, number of entries: 8
│ + -rw----     2.0 fat      470 b- defN 80-Jan-01 00:00 META-INF/CERT.SF
│ + -rw----     2.0 fat      776 b- defN 80-Jan-01 00:00 META-INF/CERT.RSA
│ + -rw----     2.0 fat      417 b- defN 80-Jan-01 00:00 META-INF/MANIFEST.MF
│   -rw----     1.0 fat     1413 bx stor 13-Oct-15 18:21 res/drawable/ic_launcher.png
│   -rw----     2.0 fat      588 bl defN 13-Oct-15 18:21 res/layout/activity_main.xml
│   -rw----     2.0 fat     4636 bl defN 13-Oct-15 18:21 AndroidManifest.xml
│   -rw----     1.0 fat     1172 b- stor 13-Oct-15 18:21 resources.arsc
│   -rw----     2.0 fat     7336 bl defN 13-Oct-15 18:21 classes.dex
│ - -rw----     2.0 fat      417 bl defN 13-Oct-15 18:21 META-INF/MANIFEST.MF
│ - -rw----     2.0 fat      470 bl defN 13-Oct-15 18:21 META-INF/CERT.SF
│ - -rw----     2.0 fat      776 bl defN 13-Oct-15 18:21 META-INF/CERT.RSA
│ - 8 files, 16808 bytes uncompressed, 8929 bytes compressed:  46.9%
│ + 8 files, 16808 bytes uncompressed, 8939 bytes compressed:  46.8%

Should fix this...