"SignApk" in Created-By header

The switch to apksig changed the Created-By header value in .SF file
from "1.0 (Android SignApk)" to "1.0 (Android apksigner)". This commit
reverts the value back to "1.0 (Android SignApk)".

Change-Id: I2fc462cade40a5b31bb6191996fd6f18fabbf08f
diff --git a/tools/signapk/src/com/android/signapk/SignApk.java b/tools/signapk/src/com/android/signapk/SignApk.java
index 84fddec..10e220c 100644
--- a/tools/signapk/src/com/android/signapk/SignApk.java
+++ b/tools/signapk/src/com/android/signapk/SignApk.java
@@ -1010,6 +1010,7 @@
                                 .setV1SigningEnabled(true)
                                 .setV2SigningEnabled(signUsingApkSignatureSchemeV2)
                                 .setOtherSignersSignaturesPreserved(false)
+                                .setCreatedBy("1.0 (Android SignApk)")
                                 .build()) {
                     // We don't preserve the input APK's APK Signing Block (which contains v2
                     // signatures)