Fix crash when exporting key file from internal storage.
This is the first release for which the offline/nonet variant is released also after upgrading the app to .net for Android. Note: the offline variant is a preliminary build as it currently cannot be installed side-by-side with the regular version. Also, apk size is much larger than needed. (The apk contains all libraries from the version with internet access.)
Please note:
- there was a "v1.12-r8" as Github release which contained an incorrect build of the NoNet variant. This should not be used.
- This release is a working "Keepass2Android Offline" ("nonet") build without Internet permission, but it contains some superfluous libraries (for accessing Mega, OneDrive and FTP). These are not used, but will be removed in subsequent releases.