#1 --lowercase tag doesn't work in 0.9

[Matt Bogosian]

The --lowercase tag looks like it is ignored (at least
with --batch mode) in version 0.9.5 (installed from deb
package):

% ls
cheap_sunglasses.ogg
% tagclean --batch --lowercase ./cheap_sunglasses.ogg
Tagclean 0.9.1 running in singlemode %a_-_%s
Path: ./cheap_sunglasses.ogg

Original: cheap_sunglasses.ogg
% ls
ZZ_Top_-_Cheap_Sunglasses.ogg