Remove logback.xml from raw2ometiff jar

[melissalinkert]

Same idea as glencoesoftware/bioformats2raw#169.

Basic testing:

$ ./gradlew clean build
$ cd build/distributions
$ unzip raw2ometiff-*-SNAPSHOT.zip
$ cd raw2ometiff-*-SNAPSHOT
$ find . -name logback.xml
./lib/config/logback.xml
$ jar tf lib/raw2ometiff-*-SNAPSHOT.jar | grep logback
$ bin/raw2ometiff --debug DEBUG /path/to/any.zarr test.ome.tiff
# edit lib/config/logback.xml to something other than the default, next command's output should reflect the changes
$ bin/raw2ometiff --debug DEBUG /path/to/any.zarr test2.ome.tiff