build: don't error on .fdroid* files in fdroiddata
build: don't error on .fdroid* files in fdroiddata

This avoids the following incorrect error:

	fdroidserver.common.FDroidException: Only one local metadata file allowed! Found: .fdroid.keystorepass.txt .fdroid.keypass.txt

f-droid/fdroidserver,fdroidtravis/fdroidserver,f-droid/fdroidserver,fdroidtravis/fdroidserver,f-droid/fdroidserver,f-droid/fdroidserver,fdroidtravis/fdroidserver,f-droid/fdroid-server,f-droid/fdroid-server,fdroidtravis/fdroidserver,f-droid/fdroid-server,f-droid/fdroid-server,f-droid/fdroidserver,f-droid/fdroid-server