clearer output: replace tempdir with something less verbose

[marcospb19]

Look at this

[INFO] ".tmp-ouch-6Fwzdy/target/debug/deps/libmemchr-2e846067e30e257e.rmeta" extracted. (1.15 MiB)
[INFO] ".tmp-ouch-6Fwzdy/target/debug/deps/unicode_ident-0bd823b3624b898e.d" extracted. (1.09 kiB)
[INFO] ".tmp-ouch-6Fwzdy/target/debug/deps/linux_raw_sys-13ac16a1284c02bd.d" extracted. (2.42 kiB)
[INFO] ".tmp-ouch-6Fwzdy/target/debug/deps/libscopeguard-50a4a54143557e77.rlib" extracted. (27.41 kiB)
[INFO] ".tmp-ouch-6Fwzdy/target/debug/deps/cfg_if-6afc45ef9c22aff9.d" extracted. (618.00 B)
[INFO] ".tmp-ouch-6Fwzdy/target/debug/deps/libaho_corasick-d5aab0eedcfef316.rmeta" extracted. (1.74 MiB)
[INFO] ".tmp-ouch-6Fwzdy/target/debug/deps/snap-009e8b6e60f3dffb.d" extracted. (5.57 kiB)
[INFO] ".tmp-ouch-6Fwzdy/target/debug/deps/libnom-dd3940934dd8054e.rlib" extracted. (3.54 MiB)
[INFO] ".tmp-ouch-6Fwzdy/target/debug/deps/time_core-5ff20190e0609735.d" extracted. (1.44 kiB)
[INFO] ".tmp-ouch-6Fwzdy/target/debug/deps/libbit_vec-8e0c2c3dba9f8d30.rmeta" extracted. (166.77 kiB)
[INFO] ".tmp-ouch-6Fwzdy/target/debug/deps/libclang_sys-f9aff58e61de0cc9.rlib" extracted. (10.55 MiB)
[INFO] ".tmp-ouch-6Fwzdy/target/debug/deps/libutf8parse-912042d8cd70575b.rlib" extracted. (32.59 kiB)
[INFO] ".tmp-ouch-6Fwzdy/target/debug/deps/libclap_builder-b34f7e379f25096e.rlib" extracted. (7.49 MiB)
[INFO] ".tmp-ouch-6Fwzdy/target/debug/deps/libminiz_oxide-cd1c349aa46486b5.rlib" extracted. (2.19 MiB)
[INFO] ".tmp-ouch-6Fwzdy/target/debug/deps/bytesize-87a957a7da69aa78.d" extracted. (1.02 kiB)

With the changes in #768, we don't have a reason to display the first path component.