"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
1 file changed