log file naming consistent with output naming

[zestrada]

Same file name preservation change as #44 , but also for log file names:

-rw-r--r-- 1 root root 5362552 Jul 30 10:02 'WNAP320 Firmware Version 2.0.3.zip'
-rw-r--r-- 1 root root  341028 Jul 30 10:02 'WNAP320 Firmware Version 2.0.binwalkv3.log'
-rw-r--r-- 1 root root 5657312 Jul 30 10:02 'WNAP320 Firmware Version 2.0.3.rootfs.tar.gz'
-rw-r--r-- 1 root root 2077274 Jul 30 10:02 'WNAP320 Firmware Version 2.0.unblob.log'
-rw-r--r-- 1 root root    4211 Jul 30 10:02 'WNAP320 Firmware Version 2.0.binwalk.log'
-rw-r--r-- 1 root root 5599495 Jul 30 10:02 'WNAP320 Firmware Version 2.0.unblob.0.tar.gz'
-rw-r--r-- 1 root root 5599495 Jul 30 10:02 'WNAP320 Firmware Version 2.0.binwalk.0.tar.gz'

becomes

-rw-r--r-- 1 root root 5362552 Jul 30 10:19 'WNAP320 Firmware Version 2.0.3.zip'
-rw-r--r-- 1 root root  340180 Jul 30 10:19 'WNAP320 Firmware Version 2.0.3.binwalkv3.log'
-rw-r--r-- 1 root root    4211 Jul 30 10:19 'WNAP320 Firmware Version 2.0.3.binwalk.log'
-rw-r--r-- 1 root root 5657314 Jul 30 10:19 'WNAP320 Firmware Version 2.0.3.rootfs.tar.gz'
-rw-r--r-- 1 root root 2077266 Jul 30 10:19 'WNAP320 Firmware Version 2.0.3.unblob.log'
-rw-r--r-- 1 root root 5599497 Jul 30 10:19 'WNAP320 Firmware Version 2.0.3.binwalk.0.tar.gz'
-rw-r--r-- 1 root root 5599497 Jul 30 10:19 'WNAP320 Firmware Version 2.0.3.unblob.0.tar.gz'